什么是主语从句,宾语从句,表语从句,同位语从句,定语从句,状语从句?请举例子,在加以分析.

表语从句就是用一个句子作为表语。说明主语是什么，由名词、形容词或相当于名词或形容词的词或短语充当表语。 表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、形容词、副词、介词短语、不定式、动词的ing、从句来充当，它常位于系动词之后。如果句子的表语也是由一个句子充当的，那么这个充当表语的句子就叫做表语从句。 表语从句的注意事项： 1、表语从句一定要用正常语序。 2、if不能引导表语从句，只能用whether来引导。 3、不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。 4、that在表语从句中不可以省掉。表语从句只能置于主句之后，而主句的动词只能是连系动词。

就是把表语用句子代替! 表语从句用法小结 　　一、表语从句的定义： 　　表语从句放在连系动词之后,充当复合句中的表语. 　　二、表语从句的构成： 　　关联词+简单句 　　三、引导表语从句的关联词的种类： 　　1.可接表语从句的连系动词有be,look,seem,sound,appear等. 　　China is no longer what she used to be. 　　今日的中国不再是过去的中国了. 　　The question remains whether they will be able to help us. 　　问题还是他们能否帮我们. 　　At that time,it seemed as if I couldn"t think of the right word. 　　当时,我似乎怎么也想不出一个恰当的字眼来. 　　2.从属连词whether,as,as if / though引导的表语从句. 　　He looked just as he had looked ten years before. 　　他看起来还与十年前一样. 　　It sounds as if someone is knocking at the door. 　　听起来好像有人在敲门. 　　3.because,why引导的表语从句. 　　That"s because he didn"t understand me. 　　那是因为他没有理解我.（That"s because…强调原因） 　　That"s why he got angry with me. 　　那正是他对我生气的原因.（That"s why…强调结果） 　　what引导的主语从句表示结果或名词reason作主语时,后面的表语从句表示原因时要用that引导,不宜用because. 　　The reason why I was sad was that he didn"t understand me. 　　我难过的原因是他没有理解我. 　　4.连接代词who,whom,whose,what,which,whoever,whatever,whichever 　　连接副词 where,when,how,why 　　The problem is who we can get to replace her. 　　问题是我们能找到谁去替换她呢. 　　The question is how he did it. 　　问题是他是如何做此事的. 　　That was what she did this morning on reaching the attic. 　　那就是她今晨上了阁楼干的. 　　5.从属连词that 　　The trouble is that I have lost his address. 　　麻烦是我把他的地址丢了. 　　6.使用虚拟语气的表语从句 　　在表示建议、劝告、命令含义的名词后的表语从句,谓语动词需用“should+动词原形” 表示,should可省略.常见的词有：advice,suggestion,order,proposal,plan,idea等. 　　My suggestion is that we （should） start early tomorrow. 　　我的建议是我们明天一早就出发. 　　四、应注意的问题： 　　1.连系动词be,appear,seem,look等之后可以跟表语从句. 　　It was because he didn"t pass the exam. 　　那是因为他没有通过考试. 　　It seems（that）he was late for the train. 　　看来他没搭上火车. 　　It appears that she was wrong. 　　看来她错了. 　　It seems to me that we should answer for this. 　　在我看来,我们似乎应该对此事负责. 　　It appears to her that he wants to teach us all he has. 　　在她看来,他似乎要把他所会的都教给我们. 　　2.引导表语从句的引导词有以下几类. 　　1）wh-疑问词 　　My question is who left. 　　我想问的是谁离开了. 　　What I wonder is when he left. 　　我想知道他是何时离开的. 　　That"s what he wants. 　　那是他想要的. 　　This is where they once lived. 　　这就是他们曾经住过的地方. 　　That is why he didn"t come here.这就是他为何没到这儿来的原因. 　　2）whether 　　My question is whether he left（or not）.我的问题是他是否离开了. 　　注：if不能引导表语从句. 　　3）that 　　The fact is that he left.事实是他离开了. 　　注：引导表语从句的连词that间或可以省略. 　　The truth is（that）I didn"t go there.事实是我没去那儿. 　　4）because,as,as if,as though 　　It"s just because he doesn"t know her.这是仅仅因为他不认识她. 　　Things are not always as they seem to be.事物并不总是如其表象. 　　He looks as if he"s tired.他好像累了.

就是用来表达的，比如说isaidyouthatyouwereserious，其中thatyouwereserious就是表语从句

表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当。表语是说明主语的身份、性质、品性、特征和状态的词或从句，表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当，它常位于系动词（be，become，appear， seem，look，sound，feel，get，smell等词）之后。例句：I am fine. （ fine 是形容词，作表语）He is a boy. （ boy 是名词，作表语）Five plus two is seven. （ seven 是数词，作表语）We are here. （ here 是副词，作表语）He is not at home. （at home 是介词短语，作表语）My hobby is reading. （ reading 是动名词，作表语）Our duty is to make our environment better.（to make 是不定式，作表语）表语从句表语从句的引导词和主语从句的引导词有区别。主语从句的引导词包括if,但if并不引导表语从句，只有一个特例是与as连用，用as if 引导表语从句；另外，表语从句的引导词也包括as,as though,because等。此外,that在表语从句中间不可以省略。而在主语从句中，有时是可以省略的。What the police want to know is when you entered the room.警察想知道的是你什么时候进的房间。The trouble is that we are short of funds.我们的困难是缺乏资金。This is what we should do.这是我们应当做的。That"s why I want you to work there.那就是我要你在那儿工作的原因。

特征和状态的，它常位于系动词之后。如果句子的表语也是由一个句子充当的，那么这个充当表语的句子就叫做表语从句。名词作表语 Africa is a big continent. 非洲是个大洲代词作表语 What"s your fax number? 你的传真号是多少？形容词作表语 I feel much better today. 我今天感觉好多了。The trouble is that we are short

就是把表语用句子代替!表语从句用法小结　　一、表语从句的定义：　　表语从句放在连系动词之后，充当复合句中的表语。　　二、表语从句的构成：　　关联词+简单句　　三、引导表语从句的关联词的种类：　　1.可接表语从句的连系动词有be，look，seem，sound，appear等。　　Chinaisnolongerwhatsheusedtobe.　　今日的中国不再是过去的中国了。　　Thequestionremainswhethertheywillbeabletohelpus.　　问题还是他们能否帮我们。　　Atthattime，itseemedasifIcouldn"tthinkoftherightword.　　当时，我似乎怎么也想不出一个恰当的字眼来。　　2.从属连词whether，as，asif/though引导的表语从句。　　Helookedjustashehadlookedtenyearsbefore.　　他看起来还与十年前一样。　　Itsoundsasifsomeoneisknockingatthedoor.　　听起来好像有人在敲门。　　3.because，why引导的表语从句。　　That"sbecausehedidn"tunderstandme.　　那是因为他没有理解我。（That"sbecause…强调原因）　　That"swhyhegotangrywithme.　　那正是他对我生气的原因。（That"swhy…强调结果）　　what引导的主语从句表示结果或名词reason作主语时，后面的表语从句表示原因时要用that引导，不宜用because.　　ThereasonwhyIwassadwasthathedidn"tunderstandme.　　我难过的原因是他没有理解我。　　4.连接代词who，whom，whose，what，which，whoever，whatever，whichever　　连接副词where，when，how，why　　Theproblemiswhowecangettoreplaceher.　　问题是我们能找到谁去替换她呢。　　Thequestionishowhedidit.　　问题是他是如何做此事的。　　Thatwaswhatshedidthismorningonreachingtheattic.　　那就是她今晨上了阁楼干的。　　5.从属连词that　　ThetroubleisthatIhavelosthisaddress.　　麻烦是我把他的地址丢了。　　6.使用虚拟语气的表语从句　　在表示建议、劝告、命令含义的名词后的表语从句，谓语动词需用“should+动词原形”表示，should可省略。常见的词有：advice，suggestion，order，proposal，plan，idea等。　　Mysuggestionisthatwe（should）startearlytomorrow.　　我的建议是我们明天一早就出发。　　四、应注意的问题：　　1.连系动词be，appear，seem，look等之后可以跟表语从句。　　Itwasbecausehedidn"tpasstheexam.　　那是因为他没有通过考试。　　Itseems（that）hewaslateforthetrain.　　看来他没搭上火车。　　Itappearsthatshewaswrong.　　看来她错了。　　Itseemstomethatweshouldanswerforthis.　　在我看来，我们似乎应该对此事负责。　　Itappearstoherthathewantstoteachusallhehas.　　在她看来，他似乎要把他所会的都教给我们。　　2.引导表语从句的引导词有以下几类。　　1）wh-疑问词　　Myquestioniswholeft.　　我想问的是谁离开了。　　WhatIwonderiswhenheleft.　　我想知道他是何时离开的。　　That"swhathewants.　　那是他想要的。　　Thisiswheretheyoncelived.　　这就是他们曾经住过的地方。　　Thatiswhyhedidn"tcomehere.这就是他为何没到这儿来的原因。　　2）whether　　Myquestioniswhetherheleft（ornot）。我的问题是他是否离开了。　　注：if不能引导表语从句。　　3）that　　Thefactisthatheleft.事实是他离开了。　　注：引导表语从句的连词that间或可以省略。　　Thetruthis（that）Ididn"tgothere.事实是我没去那儿。　　4）because，as，asif，asthough　　It"sjustbecausehedoesn"tknowher.这是仅仅因为他不认识她。　　Thingsarenotalwaysastheyseemtobe.事物并不总是如其表象。　　Helooksasifhe"stired.他好像累了。

位于系动词后的就是表语。表语是回答主语“是什么”或“怎么样”的语法成分。即是指“是”字句“是”字后面的成分。表语就是起表述作用的句子成分。它修饰的是主语。

你知道什么是表语吧？就是跟在be动词后面的表示表述的词语就是了，现在把这个词换成一个句子就行比如：Theproblemiswhenwecangetapayrise，后面就是表语从句。嘿嘿

用作表语的从句叫做表语从句 。引导表语从句的关联词有从属连词、疑问代词、疑问副词、缩合连接代词等。例如：The problem is what we should do to help him. 问题是我们该做些什么来帮助他。(关联词是疑问代词what)He works too hard. That is what is wrong with him. 他工作太努力。这就是他不对劲的地方。(关联词是疑问代词what)I"m who you"re looking for. 我是你正在找的那个人。What is troubling us is where we can find him. 使我们伤脑筋的问题是在哪儿能找到他。(关联词是疑问副词where)

在句子中用作表语的从句叫做表语从句（predicative clause), 引导表语从句的关联词有疑问代词、疑问副词、缩合连接代词、从属连词等。如：The problem is who we can get to replace her. （问题是我们能找到谁去替换她。）关联词是疑问代词who, 表语从句是who we can get to replace her。The pencil is where it was. ( 那支铅笔就在原来的地方。）关联词是疑问副词where，表语从句是where it was。The trouble is that we are short of money. (麻烦是我们缺钱。）关联词是从属连词 that, 表语从句是that we are short of money 。注：引导表语从句的关联词一般不可以省去。

系动词后面的从句就是表语从句

表语是用来说明主语的特征、状态等，补充说明主语的意义，因此，它也叫作主语补语。表语一般用在连系动词后面，连系动词除了be之外，还有become（成为）、look（看起来）、turn（变成）、go（变成）、seem（似乎）、appear（似乎、显得）、feel（摸起来）、sound（听起来）、smell（闻起来）等等。可做表语的有: 形容词、代词、名词、分词、动名词、数词、介词短语或副词和从句：例如： We are students. He is very clever. 表语从句：表语从句在句中作表语，位于主句中的系动词之后，如： The question is who can complete the difficult task . 问题是谁能完成这项艰巨的任务。表语从句还可用 as if引导。He looked as if he was going to impress everything in the room into his mind. 他看上去是要把屋里的一切都印入脑海分析表语从句的文章： http://gaokao.ewstudy.com/xtfx/2007/08/2007-08-295056.html 你自己看吧

表就是说明的意思系动词后说明主语的句子成分叫表语用从句在系动词后说明主语就是表语从句如这就是我想知道的thisiswhatiwanttoknowthis是主语is是系动词whatiwanttoknow就是表语从句

我先说一下英语中的复合句，也就是由两个或两个以上有主谓结构的小句子被从属连词连接起来组成的大句子，其中有一个小句子是主体，叫做主句。而其他的小句子就叫做从句。宾语从句就是在复合句中充当宾语的那个小句子，表语从句就是充当表语的那个小句子。

一个句子做表语，那么这个句子就叫表语从句。 看一个句子是否含有表语从句，就要辨别这个句子是否是主系表结构。如果这个句子有系动词了，那么就是主系表结构了。至于哪些动词是系动词，你可以在平常的词汇学习时留意单词后面的词性标注。比如be,like,seem,feel,become等。

解释如下主语从句，表语从句的区别就是在句子里做主语还是表语成分。例句主语从句Whowillbeourmonitorhasn"tbeendecidedyet.Whowillbeourmonitor在句中作主语表语从句Thetroubleisthatweareshortoffundsthatweareshortoffunds在句中作表语

宾语从句(1)对于宾语从句要掌握以下三点①语序: 从句的语序必须是陈述句语序, 即“主语 + 谓语”这种形式。②时态: 当主句是一般现在时或一般将来时的时候, 从句可以是任何时态, 而当主句是一般过去时的时候, 从句, 从句时态必须是过去时范围的时态, 即(一般过去时, 过去进行时, 过去完成时, 过去将来时)。③连接词: 当从句意思完整, 主句意思肯定时, 连接词用that, 且可以省去, 当从句意思完整, 主句意思不确定或含否定含意时, 常用if或whether(是否), 当从句意思不完整时, 连接词则是代替不完整部分的特殊疑问词。状语从句(2)对于状语从句, 我们主要学习了时间状语从句和条件状语从句。对于这两种状语从句, 除了注意语序要用陈述句语序外, 在时态上尤其要注意, “主将从现”这种结构(即: 当主句是将来时态时候), 从句如果也要用将来时, 则必须用一般现在时代替一般将来时, 时间状语从句和条件状语从句的连接词通常为: when, while, as soon as, until和if。所以, 当连接词为以上五个词时, 如果主句是将来时, 就要考虑从句是否也要用将来时, 如果是, 则用“主将从现”结构, 其它还有由so…that…构成的结果状语从句, 由Though…或…but…, 构成的让步状语从句和由because或so构成的原因状语从句, 注意Though(虽然)与but(但是), because(因为)与so(所以)不能同时出现在句子里, 只用其中之一表达汉语中两个词的意义。表语从句在句子中起表语作用的从句叫做表语从句，位于主句系动词的后面。表语从句的引导词和主语从句的引导词相同。也是名词性从句的一种。如：What What the police want to know is when you enred red the room警察想知道的是你什么时候进的房间。The The trouble is that we are short of funds困难是我们缺乏资金。This This is what we should do这是我们应当做的。That”s s why I want you to work there那就是我要你在那儿工作的原因。His His first question was whether Mr. Smith had arrived yet他的第一个问题是史密斯先生到了没有。注意：从句中的疑问句用正常语序，即陈述语序。as as if, as though, becau也可用来引导表语从句。She She seems as if she had done a great thing她看起来好像做了一件大事。It It is because you eat too much那是因为你吃得太多了。

定 语 从 句 一、 限定性定语从句 1. that即可代表事物也可代表人,which代表事物；它们在从句中作主语或宾语,that在从句中作宾语时常可省略关系词,which在从句中作宾语则不能省略.而且,如果which在从句中作“不及物动词＋介词”的介词的宾语,注意介词不要丢掉,而且介词总是放在关系代词which的前边,但有的则放在它原来的位置 1) The first doll say “mama”was invented in 1830． 〔A〕 that it could 〔B〕 could it 〔C〕 it could 〔D〕 that could 2) A solar day is the length of time the Earth to revolve once around the Sun． 〔A〕 takes 〔B〕 takes it 〔C〕 which takes 〔D〕 he takes 3) The period during when 〔A〕 people learned 〔B〕 to melt iron is called 〔C〕 the 〔D〕 Iron Age． 2. which作宾语时,根据先行词与定语从句之间的语义关系,先行词与which之间的介词不能丢 4) The second half of his voyage was by far the more dangerous part, he sailed round the treacherous Cape Horn. 〔A〕 where 〔B〕 of which 〔C〕 during which 〔D〕 that 5) To travel from England to Hope Corn had taken him nine months, the sailing time was 226 days. He had done what he wanted to acplish. 〔A〕 when 〔B〕 which 〔C〕 of which 〔D〕 that 3. 代表物时多用which,但在带有下列词的句子中用that而不用which,这些词包括all, anything, much等,这时的that常被省略(见本节“四、关系代词的省略”) 4. who和whom引导的从句用来修饰人,分别作从句中的主语和宾语,whom作宾语时,要注意它可以作动词的宾语也可以作介词的宾语 6) Henry Ford is the person 〔A〕 which 〔B〕 is most responsible 〔C〕 for developing 〔D〕 the idea of mass production. 7) Human beings are social 〔A〕 animals whom 〔B〕 usually prefer not to live in 〔C〕 physical or psychological isolation 〔D〕 ． 5. where是关系副词,用来表示地点的定语从句 8) The Everglades is a beautiful region of southern Florida the primitive past mingles with modern life． 〔A〕 there 〔B〕 where 〔C〕 after 〔D〕 in 9) The knee is the joint the thigh bone meets the large bone of the lower leg． 〔A〕 when 〔B〕 where 〔C〕 why 〔D〕 which 10) A metropolitan region 〔A〕 is defined as a central 〔B〕 city and the territory where 〔C〕 surrounds 〔D〕 it． 6. when引导定语从句表示时间 11) The next morning he came down to breakfast, he was beaming with the pleasure of a new, great discovery. 〔A〕 as 〔B〕 when 〔C〕 because 〔D〕 that 12) In a day few noble persons ever spoke to those of humble origins except to give an order, Jefferson went out of his way to talk with gardeners, servants, and waiters. 〔A〕 whose 〔B〕 during 〔C〕 when 〔D〕 of 13) Moreover, in the modern age human beings depend so much on machines, he had given men throughout the world new pride. 〔A〕 when 〔B〕 whether 〔C〕 more 〔D〕 ever 〔注〕 值得一提的是,表示时间“time”一词的定语从句只用when引导,有时不用任何关系代词,当然也不用that引导 By the time you arrive in London, we will have stayed there for two weeks. ／ I still remember the first time I met her. ／ Each time he goes to besiness trip, he brings a lot of living necessities, such as towers, soap, toothbrush etc. 7. whose是关系代词,修饰名词作定语,相当于所修饰成分的前置所有格 14) There was a teapot fashioned like a China duck out of open mouth the tea was supposed to e. 〔A〕 which 〔B〕 its 〔C〕 that 〔D〕 whose 15) Jackir Mcleans"s recordings have shown that he is one of the few 〔A〕 jazz musicians who 〔B〕 style of playing 〔C〕 has kept pace with the evolution 〔D〕 of modern jazz． 8. 当从句的逻辑主语是some, any, no, somebody, anybody, nobody, something, anything, everything或nothing时,常用there is来引导 16) I don"t want to concentrate on anything worrying me. 〔A〕 what is 〔B〕 there is 〔C〕 what 〔D〕 there 二、非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明,通常和主句间用逗号隔开,将从句拿掉后其他部分仍可成立 1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分 2. 在引导限定性定语从句时,that有时相当于in which, at which, for which或at which Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed. 人们对白日做梦的态度正在改变,这与人们对夜间做梦的看法的变化有非常相似之处. I like the music for the very reason that(for which) he dislike it. 我出于某种原因喜欢这种音乐,而他恰恰与我相反. We arrived the day that(on which) they left. 刚好我们到的那天他们走了. 3. 有时as也可用作关系代词 4. 在非限定性定语从句中,不能用that,而用who, whom代表人,用which代表事物 17) Ligaments(韧带), , hold organs of the body in place and fasten bones together． 〔A〕 which are fibrous tissues 〔B〕 they are fibrous tissues 〔C〕 fibrous tissues that 〔D〕 are fibrous tissues 18) The Little White House in Warm Springs was the Georgia home of President Franklin D. Roosevelt, there on April 12, 1945． 〔A〕 who died 〔B〕 died 〔C〕 while died 〔D〕 he died 19) The first United States citizen to bee 〔A〕 a professional 〔B〕 sculptor was Patience Lovell Wright, which 〔C〕 works were executed in wax 〔D〕 ． 三、定语从句结构错误 1. 缺关系词 20) The adder is a snake has 〔A〕 a relatively 〔B〕 stout body, a short tail 〔C〕 , and a flat head 〔D〕 ． 2. 从句中缺成分 21) Traditionally, ethnographers and linguists have paid 〔A〕 little attention to cultural interpretations given to 〔B〕 silence, or to 〔C〕 the types of social contexts in which tends 〔D〕 to occur． 四、连接代词的省略 22) Most crocodiles will eat anything capture and overpower． 〔A〕 can 〔B〕 they can 〔C〕 which can 〔D〕 and 五、例题解析 1) D为正确答案.本句中的主句为“The first doll was invented in 1830”,“that could say ‘mama"”为定语从句,修饰主句中的名词(主语)“the first doll”. 2) C为正确答案. 3) A错.during是介词,它后面的关系代词只能用which(指人除外),which在此处指代“the period”,定语从句为“during which people…iron”,修饰主句的主语“the period”. 4) C为正确答案. 5) C为正确答案. 6) B错.改用who,which只能指物,指人时应用who,本句的定语从句修饰the person,关系代词who在从句中作主语.本句也可改用that,因为that也可用来指人,它可在从句中作主语或宾语,但which则只能指“物”. 7) B错.应改用who,因为这里所指代的是“human beings”,而且在从句中作主语,而whom只能用来作宾语. 8) B为正确答案.空白后是一个定语从句,从句中主谓宾齐全,关系副词where指代上面表示地点的名词region(地方,地区),相当于in which,即in the region,在从句中作地点状语. 9) B对.空白后为定语从句,从句中的主谓宾语都已齐全,where作从句中的地点状语,相当于in the joint,整个从句修饰“the joint”. 10) C错.改为which或that.这里是一个定语从句,修饰前面的the territory(区域),虽然被修饰成分表示一个地点,但若用where代替in the territory在从句中作地点状语,从句中便没有了主语,这显然不对.改用which后,便可由它作从句中的主语,代the territory；从句中的it代上文中的a central city. 11) B为正确答案. 12) C为正确答案. 13) A为正确答案. 14) D为正确答案.这里whose修饰名词短语“open mouth,” 这时“whose open mouth”一起作介词“of”的宾语. 15) B错.who应当在定语从句中作主语,而从句中已有主语style of playing(演奏风格),故应将who改为whose,用whose修饰style,指代上文中的人名,相当于his. 16) B为正确答案. 17) A对.空白处是which引导的定语从句修饰主句的主语ligaments,which作从句的主语,主句的主语(ligaments)和谓语(hold)被定语从句所隔开. 18) A对.本句是关系代词who引导的非限定性定语从句,who指代前面的被修饰成分President Franklin D. Roosevelt并在从句中作主语. 19) C错.应改用whose,修饰从句中的主语works,whose相当于his. 20) A错.本句已有谓语动词is,而后面又出现动词has,显然不合语法,故应在snake和has之间加上关系代词which或that构成定语从句修饰snake,which作从句的主语. 21) D错.本句“in which”中的which指代“social contexts”,which在从句中已经是介词in的宾语,这样从句中便没有了主语,故应在which后加代词it(代silence),即变为“in which it tends…”,用it作从句的主语,这样句子才完整. 22) B对.关系代词作限定性定语从句中的宾语时可以省略,本句被修饰词anything后就省去了“that”；C是不对的,首先,C中的which作从句的主语,而从句中的动词(作谓语)capture and overpower都为及物动词,可后面没有宾语,这样句子便不完整；其次,如果被修饰成分为不定代词(anything, all等),或修饰成分前有形容词最高级以及限定性较强的形容词修饰时(the very,the only,the same,the first,the last,the tallest),应使用关系代词that,而不用which. 宾语从句 1. 由连词that、疑问代词或副词(如how, why和where等)引出的宾语从句 2 介词后的宾语,其宾语可以是名词或代词,也可以是个句子,即宾语从句,也可以由“what”来引导 表语从句(predicative clause) 如This is what I want to say(这是我要说的)中的what I want to say.

系动词后说明主语的从句就是表语从句注意表语从句属于名词性从句前面不能再有名词或代词否则就是定语从句如thisiswhathesaid表语从句thisisallthathesaid定语从句

宾语从句:在句子中起宾语作用的从句叫做宾语从句.宾语从句分为三类:动词的宾语从句,介词的宾语从句和形容词的宾语从句.表语从句:就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当，和连系动词一起构成谓语。连接表语从句的连接词有：that,what,who,when,where,which,why,表语从句只能置于主句之后，而主句的动词只能是联系动词定语从句:定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。（注意：介词后面的关系词不能省略）主语从句定义:如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句.（从句的语序永远是陈述句）强调句型：强调修饰二字。（用助动词“do（does／did）＋动词原形，用形容词very，only，single，such,last等修饰名词或形容词来加强语气，用intheworld，onearth，atall等介词短语可以表达更强的语气（常用于疑问句)，用强调句型：“Itis（was）＋被强调的部分＋that（who）＋原句其它部分”来强调说话人的意愿，用If来表示强调，标点符号也是加强修饰的方式。）明白没?

回答如下：主语从句：顾名思义，用来作主语的从句叫做主语从句。它有两个位置：置于句首；置于主句之后，前面用it作形式主语。例如：That he is ill is true = It is true that he is ill. 宾语从句：置于及物动词之后或置于介词之后。例如：He knows where Mary lives. I don"t care about whether he will go. 表语从句：置于系动词之后。例如：The fact is that he broke the vase that day. It seems as if he knows it. 定语从句：置于所修饰名词之后。例如：This is the book which I bought yesterday.

跟在系动词后面的叫表语。举例：seem 是系动词，He seems tired.此处tired 为表语。但是一般的行为动词后面的叫宾语，比如like.I like you. you 是宾语

定状补分别修饰主谓宾，主系表。什么从句就是修饰什么成分的句子比如：I like apples that dilicious....后两词修饰苹果为宾语从句

　　表语从句（Predicative Clause）就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当表语。　　表语从句定义：在一个复合句中，从句作的是主句的表语成分。　　A　　The problem is puzzling.　　这个问题令人困惑。　　主语+连系动词+形容词作表语　　The problem is when we can get a pay rise.　　问题是什么时候我们可以得到加薪。　　主语+连系动词+句子作表语（表语从句）　　B　　连接表语从句的连接词有：that, what, who, when, where, which, why, whether, how, whoever，whichever ，whatever等。还有如because, as if, as though等。　　He has become a teacher.　　他已经成为一名教师。　　He has become what he wanted to be ten years ago.　　他已经成为了他10 年前想成为的。　　His suggestion is good.　　他的建议是好的。　　His suggestion is that we should stay calm.　　他的建议是，我们应该保持冷静。　　The question is confusing.　　这个问题令人困惑。　　The question is when he can arrive at the hotel.　　问题是，他什么时候可以到达酒店。

就是把表语用句子代替! 表语从句用法小结 　　一、表语从句的定义： 　　表语从句放在连系动词之后,充当复合句中的表语. 　　二、表语从句的构成： 　　关联词+简单句 　　三、引导表语从句的关联词的种类： 　　1.可接表语从句的连系动词有be,look,seem,sound,appear等. 　　China is no longer what she used to be. 　　今日的中国不再是过去的中国了. 　　The question remains whether they will be able to help us. 　　问题还是他们能否帮我们. 　　At that time,it seemed as if I couldn"t think of the right word. 　　当时,我似乎怎么也想不出一个恰当的字眼来. 　　2.从属连词whether,as,as if / though引导的表语从句. 　　He looked just as he had looked ten years before. 　　他看起来还与十年前一样. 　　It sounds as if someone is knocking at the door. 　　听起来好像有人在敲门. 　　3.because,why引导的表语从句. 　　That"s because he didn"t understand me. 　　那是因为他没有理解我.（That"s because…强调原因） 　　That"s why he got angry with me. 　　那正是他对我生气的原因.（That"s why…强调结果） 　　what引导的主语从句表示结果或名词reason作主语时,后面的表语从句表示原因时要用that引导,不宜用because. 　　The reason why I was sad was that he didn"t understand me. 　　我难过的原因是他没有理解我. 　　4.连接代词who,whom,whose,what,which,whoever,whatever,whichever 　　连接副词 where,when,how,why 　　The problem is who we can get to replace her. 　　问题是我们能找到谁去替换她呢. 　　The question is how he did it. 　　问题是他是如何做此事的. 　　That was what she did this morning on reaching the attic. 　　那就是她今晨上了阁楼干的. 　　5.从属连词that 　　The trouble is that I have lost his address. 　　麻烦是我把他的地址丢了. 　　6.使用虚拟语气的表语从句 　　在表示建议、劝告、命令含义的名词后的表语从句,谓语动词需用“should+动词原形” 表示,should可省略.常见的词有：advice,suggestion,order,proposal,plan,idea等. 　　My suggestion is that we （should） start early tomorrow. 　　我的建议是我们明天一早就出发. 　　四、应注意的问题： 　　1.连系动词be,appear,seem,look等之后可以跟表语从句. 　　It was because he didn"t pass the exam. 　　那是因为他没有通过考试. 　　It seems（that）he was late for the train. 　　看来他没搭上火车. 　　It appears that she was wrong. 　　看来她错了. 　　It seems to me that we should answer for this. 　　在我看来,我们似乎应该对此事负责. 　　It appears to her that he wants to teach us all he has. 　　在她看来,他似乎要把他所会的都教给我们. 　　2.引导表语从句的引导词有以下几类. 　　1）wh-疑问词 　　My question is who left. 　　我想问的是谁离开了. 　　What I wonder is when he left. 　　我想知道他是何时离开的. 　　That"s what he wants. 　　那是他想要的. 　　This is where they once lived. 　　这就是他们曾经住过的地方. 　　That is why he didn"t come here.这就是他为何没到这儿来的原因. 　　2）whether 　　My question is whether he left（or not）.我的问题是他是否离开了. 　　注：if不能引导表语从句. 　　3）that 　　The fact is that he left.事实是他离开了. 　　注：引导表语从句的连词that间或可以省略. 　　The truth is（that）I didn"t go there.事实是我没去那儿. 　　4）because,as,as if,as though 　　It"s just because he doesn"t know her.这是仅仅因为他不认识她. 　　Things are not always as they seem to be.事物并不总是如其表象. 　　He looks as if he"s tired.他好像累了.

　　表语从句就是用一个句子作为表语。说明主语是什么，由名词、形容词或相当于名词或形容词的词或短语充当表语。 　　表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、形容词、副词、介词短语、不定式、动词的ing、从句来充当，它常位于系动词之后。如果句子的表语也是由一个句子充当的，那么这个充当表语的句子就叫做表语从句。 　　表语从句的注意事项： 　　1、表语从句一定要用正常语序。 　　2、if不能引导表语从句，只能用whether来引导。 　　3、不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。 　　4、that在表语从句中不可以省掉。表语从句只能置于主句之后，而主句的动词只能是连系动词。

表语从句 ：表语从句的定义：表语从句在复合句中作主句的表语.表语从句和主语指同一内容,它对主语进行解释、说明,使主语的内容具体化.表语是用来说明主语的身份、性质、品性、特征和状态的,表语常由名词、代词、数词、动词过去分词、动词的-ing形式、副词、介词短语、形容词、不定式和从句等来充当.Lyne is an excellent student Henry was an American businessmanHenry met an American businessman The person stood in front of you just now ismy headmaster.I didn"t know that it was you at that time. The door remained closed.

通常是指 在系动词后面、并且由疑问词引导的句子。这里的系动词是指动词be 以及其他的感官动词。

表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当。表语是说明主语的身份、性质、品性、特征和状态的词或从句，表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当，它常位于系动词（be，become，appear， seem，look，sound，feel，get，smell等词）之后。例句：I am fine. （ fine 是形容词，作表语）He is a boy. （ boy 是名词，作表语）Five plus two is seven. （ seven 是数词，作表语）We are here. （ here 是副词，作表语）He is not at home. （at home 是介词短语，作表语）My hobby is reading. （ reading 是动名词，作表语）Our duty is to make our environment better.（to make 是不定式，作表语）表语从句表语从句的引导词和主语从句的引导词有区别。主语从句的引导词包括if,但if并不引导表语从句，只有一个特例是与as连用，用as if 引导表语从句；另外，表语从句的引导词也包括as,as though,because等。此外,that在表语从句中间不可以省略。而在主语从句中，有时是可以省略的。What the police want to know is when you entered the room.警察想知道的是你什么时候进的房间。The trouble is that we are short of funds.我们的困难是缺乏资金。This is what we should do.这是我们应当做的。That"s why I want you to work there.那就是我要你在那儿工作的原因。

就是把表语用句子代替!表语从句用法小结 　　一、表语从句的定义：　　表语从句放在连系动词之后，充当复合句中的表语。　　二、表语从句的构成：　　关联词+简单句　　三、引导表语从句的关联词的种类：　　1. 可接表语从句的连系动词有be，look，seem，sound，appear等。　　China is no longer what she used to be.　　今日的中国不再是过去的中国了。　　The question remains whether they will be able to help us.　　问题还是他们能否帮我们。　　At that time，it seemed as if I couldn"t think of the right word.　　当时，我似乎怎么也想不出一个恰当的字眼来。　　2. 从属连词whether，as，as if / though引导的表语从句。　　He looked just as he had looked ten years before.　　他看起来还与十年前一样。　　It sounds as if someone is knocking at the door.　　听起来好像有人在敲门。　　3. because，why引导的表语从句。　　That"s because he didn"t understand me.　　那是因为他没有理解我。（That"s because…强调原因）　　That"s why he got angry with me.　　那正是他对我生气的原因。（That"s why…强调结果）　　what引导的主语从句表示结果或名词reason作主语时，后面的表语从句表示原因时要用that引导，不宜用because.　　The reason why I was sad was that he didn"t understand me.　　我难过的原因是他没有理解我。　　4. 连接代词who，whom，whose，what，which，whoever，whatever，whichever　　连接副词 where，when，how，why　　The problem is who we can get to replace her.　　问题是我们能找到谁去替换她呢。　　The question is how he did it.　　问题是他是如何做此事的。　　That was what she did this morning on reaching the attic.　　那就是她今晨上了阁楼干的。　　5. 从属连词that　　The trouble is that I have lost his address.　　麻烦是我把他的地址丢了。　　6. 使用虚拟语气的表语从句　　在表示建议、劝告、命令含义的名词后的表语从句，谓语动词需用“should+动词原形” 表示，should可省略。常见的词有：advice，suggestion，order，proposal，plan，idea等。　　My suggestion is that we （should） start early tomorrow.　　我的建议是我们明天一早就出发。　　四、应注意的问题：　　1. 连系动词be，appear，seem，look等之后可以跟表语从句。　　It was because he didn"t pass the exam.　　那是因为他没有通过考试。　　It seems（that）he was late for the train.　　看来他没搭上火车。　　It appears that she was wrong.　　看来她错了。　　It seems to me that we should answer for this.　　在我看来，我们似乎应该对此事负责。　　It appears to her that he wants to teach us all he has.　　在她看来，他似乎要把他所会的都教给我们。　　2. 引导表语从句的引导词有以下几类。　　1）wh-疑问词　　My question is who left.　　我想问的是谁离开了。　　What I wonder is when he left.　　我想知道他是何时离开的。　　That"s what he wants.　　那是他想要的。　　This is where they once lived.　　这就是他们曾经住过的地方。　　That is why he didn"t come here. 这就是他为何没到这儿来的原因。　　2）whether　　My question is whether he left（or not）。 我的问题是他是否离开了。　　注：if不能引导表语从句。　　3）that　　The fact is that he left. 事实是他离开了。　　注：引导表语从句的连词that间或可以省略。　　The truth is（that）I didn"t go there. 事实是我没去那儿。　　4）because，as，as if，as though　　It"s just because he doesn"t know her. 这是仅仅因为他不认识她。　　Things are not always as they seem to be. 事物并不总是如其表象。　　He looks as if he"s tired. 他好像累了。

除了be动词，还有get,become,turn,feel等

表语从句就是用一个句子作为表语。表语的作用：说明主语是什么。可以由名词、形容词或相当于名词或形容词的词或短语充当表语的成分。然而要注意，表语从句属于名词性从句，只是表语的其中一种情况——由名词充当表语。常见的引导表语从句的从属连词（Subordinating Conjunction）有when，where，why，who，how，that。它们都有代词（Pronoun）词性，即具备名词（Noun）性质，所以可以引导主语从句、同位语从句、宾语从句、表语从句全部四种名词性从句。表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、形容词、副词、介词短语、不定式、动词的-ing、从句来充当，它常位于系动词（be, become, appear, seem,look,sound,feel,get,smell等词）之后。如果句子的表语也是由一个句子充当的，那么这个充当表语的句子就叫做表语从句。

表语从句（PredicativeClause）就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当表语。　　表语从句定义：在一个复合句中，从句作的是主句的表语成分。　　A　　Theproblemispuzzling.　　这个问题令人困惑。　　主语+连系动词+形容词作表语　　Theproblemiswhenwecangetapayrise.　　问题是什么时候我们可以得到加薪。　　主语+连系动词+句子作表语（表语从句）　　B　　连接表语从句的连接词有：that,what,who,when,where,which,why,whether,how,whoever，whichever，whatever等。还有如because,asif,asthough等。　　Hehasbecomeateacher.　　他已经成为一名教师。　　Hehasbecomewhathewantedtobetenyearsago.　　他已经成为了他10年前想成为的。　　Hissuggestionisgood.　　他的建议是好的。　　Hissuggestionisthatweshouldstaycalm.　　他的建议是，我们应该保持冷静。　　Thequestionisconfusing.　　这个问题令人困惑。　　Thequestioniswhenhecanarriveatthehotel.　　问题是，他什么时候可以到达酒店。

375436290英语群，有兴趣的可以来

【二】表语从句 ：表语从句的定义：表语从句在复合句中作主句的表语.表语从句和主语指同一内容,它对主语进行解释、说明,使主语的内容具体化. 表语是用来说明主语的身份、性质、品性、特征和状态的,表语常由名词、代词、数词、动词过去分词、动词的-ing形式、副词、介词短语、形容词、不定式和从句等来充当. Lyne is an excellent student Henry was an American businessman Henry met an American businessman The person stood in front of you just now ismy headmaster. I didn"t know that it was you at that time. The door remained closed. Mary"s daily job is cleaning the house. The house is not only large but also beautiful. When I went to your house, you were out. No one was in the dorm, when shearrived. My job is to teach you English. Thereason why he came late was that his clock didn"t work. Position (位置)表语常位于系动词（be等词）之后,与主语共同构成主--系--表结构 (Subject-Predicative structure) 的句子. Linking Verbs (连系动词) 除动词be以外,还有一些后面可接表语的特殊连系动词,如：look, smell, taste, sound, feel, fall, come, go（变成…）, become, grow（渐渐地变化）, turn(变成,一般用于颜色), appear, seem, get, keep, remain, stay等. 一、表语从句定义：表语从句的定义：表语从句在复合句中作主句的表语.表语从句和主语指同一内容,它对主语进行解释、说明,使主语的内容具体化. The question is who will do it. 表语从句放在连系动词之后,充当复合句中的表语. 二、表语从句构成 （系动词） +引导词 +简单句 His suggestion is that we should stay calm That is why she was late. 三、引导表语从句的关联词 【1】从属连词that,whether；that 在表语从句中不充当任何句子成分,也没有任何意义. The trouble is that I have lost her address. 麻烦是我把她的地址弄丢了. My question is whether he left ( or not ). 我的问题是他是否离开了. The question is whether weshould ask them for help. The trouble is that he hasnever done the work before The fact is that he hasn"t yet recover from illness. The reason why he has to go is that his mother is ill inbed. 比较 that在定语从句中的用法. There are some filmsthat I"d liketo see. She is the onlystudent thatknows French. 结论:that 在引导定语从句时,指事物,也可指人, 在从句中作主语或宾语,作宾语时常可省略. 【2】.从属连词as, as if / though引导的表语从句 由as if 引导表语从句时要注意语态.若从句表示与现在事实相反,谓动用be 动词要用were 与过去事实相反用 had +过去分词 Li Lei is now in a new jacket. He looks as if he were an Americanboy. The girl is giving us a vivid description of the moon. It seems as if shehad been to the moon many times. He looked just as he had looked ten years before. It sounds as if someone is knocking at thedoor. It looks as if it were going torain. whether在表语从句中表是否 ,但不充当句子的成分.if 不能引导表语从句.如: What the doctor really doubts is whether mymother will recover from the serious disease soon 【3】because, why 引导的表语从句 (1) That"s because he didn"t understand me.那是因为他不理解我.(强调原因） (2) That"s why he got angry with me 那正是他对我生气的原因.（强调结果） 4.连接代词who, whom, whose,whoever, what, whatever, which,whichever 引导表语从句 (1) The problem is who we can get to replace her.问题是我们能找到谁去替换她呢. Guilin is not whatit used to be. What shewants to know is which dressshe should buy. The question is what caused the accident. That mountain is not what it used to be. What he told you was what had beendiscussed at the meeting. 【4】连接副词where, when, how The question is how he did it.问题是他如何做此事的.That is where he was born. 那就是他出生的地方 That is where Lu Xun used to live. That is why he didn"t pass the exam. 四. 使用虚拟语气的表语从句(if不可以引导表语从句) 在表示建议、劝告、命令含义的名词后的表语从句,谓语动词需用"should+动词原形" 表示,should可省略.常见的词有：advice, suggestion,order, proposal, plan等. My suggestion is that we (should) start early tomorrow. The question is whether we will have our sports meet next week. The reason why he failed is that he was too careless. The problem is who we can get to take the place of John.The question iswhen he can arrive at the hotel. The question is whether the enemy is marching towards us. It looked as ifhe had understood this question. The question is who will travel with me to Beijing tomorrow. The question is why hecried yesterday. 注意点1：if 不能引导表语从句 注意点2：主句主语为reason, 只能用that引导表语从句,不可用because. 注意点3：如果从句是特殊疑问句,用陈述句语序 A：表语从句一定要用陈述语序 B 不可以用if,而用whether 连接表语从句(as if 例外）. C 不像宾语从句,在有表语从句的复合句中,主句时态和从句时态可以不一致.

表语从句，用从句作表语。简单理解就是在主句系动词后面的从句。theproblemisthatwedon"thavetheticket.状语从句就是从句作状语。简单理解为：从句的主干结构（主谓宾；主系表）已经完整，用从句来解释主句动词的时间；地点；条件等。whenwebrokeintothehouse,wefoundthecarpetwasalreadyonfire.

【二】表语从句 ：表语从句的定义：表语从句在复合句中作主句的表语.表语从句和主语指同一内容,它对主语进行解释、说明,使主语的内容具体化. 表语是用来说明主语的身份、性质、品性、特征和状态的,表语常由名词、代词、数词、动词过去分词、动词的-ing形式、副词、介词短语、形容词、不定式和从句等来充当. Lyne is an excellent student Henry was an American businessman Henry met an American businessman The person stood in front of you just now ismy headmaster. I didn"t know that it was you at that time. The door remained closed. Mary"s daily job is cleaning the house. The house is not only large but also beautiful. When I went to your house, you were out. No one was in the dorm, when shearrived. My job is to teach you English. Thereason why he came late was that his clock didn"t work. Position (位置)表语常位于系动词（be等词）之后,与主语共同构成主--系--表结构 (Subject-Predicative structure) 的句子. Linking Verbs (连系动词) 除动词be以外,还有一些后面可接表语的特殊连系动词,如：look, smell, taste, sound, feel, fall, come, go（变成…）, become, grow（渐渐地变化）, turn(变成,一般用于颜色), appear, seem, get, keep, remain, stay等. 一、表语从句定义：表语从句的定义：表语从句在复合句中作主句的表语.表语从句和主语指同一内容,它对主语进行解释、说明,使主语的内容具体化. The question is who will do it. 表语从句放在连系动词之后,充当复合句中的表语. 二、表语从句构成 （系动词） +引导词 +简单句 His suggestion is that we should stay calm That is why she was late. 三、引导表语从句的关联词 【1】从属连词that,whether；that 在表语从句中不充当任何句子成分,也没有任何意义. The trouble is that I have lost her address. 麻烦是我把她的地址弄丢了. My question is whether he left ( or not ). 我的问题是他是否离开了. The question is whether weshould ask them for help. The trouble is that he hasnever done the work before The fact is that he hasn"t yet recover from illness. The reason why he has to go is that his mother is ill inbed. 比较 that在定语从句中的用法. There are some filmsthat I"d liketo see. She is the onlystudent thatknows French. 结论:that 在引导定语从句时,指事物,也可指人, 在从句中作主语或宾语,作宾语时常可省略. 【2】.从属连词as, as if / though引导的表语从句 由as if 引导表语从句时要注意语态.若从句表示与现在事实相反,谓动用be 动词要用were 与过去事实相反用 had +过去分词 Li Lei is now in a new jacket. He looks as if he were an Americanboy. The girl is giving us a vivid description of the moon. It seems as if shehad been to the moon many times. He looked just as he had looked ten years before. It sounds as if someone is knocking at thedoor. It looks as if it were going torain. whether在表语从句中表是否 ,但不充当句子的成分.if 不能引导表语从句.如: What the doctor really doubts is whether mymother will recover from the serious disease soon 【3】because, why 引导的表语从句 (1) That"s because he didn"t understand me.那是因为他不理解我.(强调原因） (2) That"s why he got angry with me 那正是他对我生气的原因.（强调结果） 4.连接代词who, whom, whose,whoever, what, whatever, which,whichever 引导表语从句 (1) The problem is who we can get to replace her.问题是我们能找到谁去替换她呢. Guilin is not whatit used to be. What shewants to know is which dressshe should buy. The question is what caused the accident. That mountain is not what it used to be. What he told you was what had beendiscussed at the meeting. 【4】连接副词where, when, how The question is how he did it.问题是他如何做此事的.That is where he was born. 那就是他出生的地方 That is where Lu Xun used to live. That is why he didn"t pass the exam. 四. 使用虚拟语气的表语从句(if不可以引导表语从句) 在表示建议、劝告、命令含义的名词后的表语从句,谓语动词需用"should+动词原形" 表示,should可省略.常见的词有：advice, suggestion,order, proposal, plan等. My suggestion is that we (should) start early tomorrow. The question is whether we will have our sports meet next week. The reason why he failed is that he was too careless. The problem is who we can get to take the place of John.The question iswhen he can arrive at the hotel. The question is whether the enemy is marching towards us. It looked as ifhe had understood this question. The question is who will travel with me to Beijing tomorrow. The question is why hecried yesterday. 注意点1：if 不能引导表语从句 注意点2：主句主语为reason, 只能用that引导表语从句,不可用because. 注意点3：如果从句是特殊疑问句,用陈述句语序 A：表语从句一定要用陈述语序 B 不可以用if,而用whether 连接表语从句(as if 例外）. C 不像宾语从句,在有表语从句的复合句中,主句时态和从句时态可以不一致.

v表示verb，动词的意思。从句就是把一个简单句变成复合句所延长句子而使用的一种手段。拿定语从句为例。eg 简单句:He is a man.他是个男的。对一个人的描述太笼统了。现在我们使用定语从句:He is a man who is hard to please.他是一个很难取悦的(男)人。所以定语从句的作用是延长句子，使句子对人,物等的描述更具体。再拿状语从句举个例子。He would be there.简单句。He would always be There When I needed him.在我最需要他的时候，他总是会出现。状语从句。是不是感觉句子丰满了许多?宾语从句也是相同的道理。

一、状语从句分类及常用连词： 类别 连 词 时间状语从句 when, whenever, while, as, before, after, since, till, once, as soon as,etc. 地点状语从句 where,wherever 原因状语从句 because, since, as, for, now that, etc. 目的状语从句 in order that, so that, that, etc. 结果状语从句 so…that, so that, such…that, that, etc. 条件状语从句 if, unless, as(so)long as, etc. 让步状语从句 though, although, even if, even though, however, whatever, as,etc. 比较状语从句 as…as, so…as, than, etc. 方式状语从句 as, as if, as though, etc. 二、相似连词的用法区别 1.when, while, as, while表时间,从句需用延续性动词,切不可用瞬间动词. when表时间,从句既可以用延续性动词,又可以用瞬间动词. as表时间,与when相似,但侧重强调主从句动作同点或同段进行. when, while后可以接分词短语. 2.because, as, since, for 语气 位置 意义 because 最强 前或后 “原因”；表客观因果关系；回答“” as 较强 前 “由于”；把众人所知的事实当作理由 since 较弱 前 “既然”；就对方陈述的事实作为理由 for 最弱 后 “理由”；对某一事实进行推断的理由 注：上面所说的“前”,指从句在主句之前；“后”,指从句在主句之后. 3.so that, so…that, such…that so that “以便”、“结果”表目的和结果.注意：在从句中有情态动词表目的.无情态动词表结果. so…that “如此的…以致于”表结果.该结构常见于： 1.so+形／副＋that 2.so+形＋a(an)＋单数名词＋that 3.so＋many/much＋复数名词（不可数名词）+thatsuch…that “如此的…以致于”表结果.该结构常见于： 1.such＋a(an)＋形＋名词＋that 2.such＋形＋复数名词／不可数名词＋that 4.though, although, as, though, although在句首表“尽管”两者都可以用.但句后不能再用but. 下列情况只能用though： ▲ as though (=as if); even if (=even though) ▲ 在句末表示“然而” as表示“尽管”,从句的表语、状语等成分要倒装. 5.whatever, however,wherever, whenever 它们是what, how, where, when的强势语气.分别等于： no matter what, no matter how no matter where, no matter when 二宾语从句 1.肯定句 结构:主句+that（可有可无）+肯定句 2.一般疑问句 结构:主句+if+一般疑问句 3.特殊疑问句 结构:主句+疑问词+肯定句. 宾语从句的时态 1.主现从不限（主句是一般现在时,从句的时态不限） 2.主过从四过（主居是一般过去时,从句的时态应是一般过去时、过去完成时、过去将来时或者过去进行时） 在复合句中用作宾语的从句叫做宾语从句.宾语从句是初中英语中最重要的一种从句,它内容完整,句型结构较为复杂,主句和从句时态搭配要求严格,在中考试题中频频出现.而且学好宾语从句也可为到高中学习间接引语、主语从句、表语从句及同位语从句打下良好的基础.学习宾语从句并不难,只要你能过好下面的三道关： 第一关,选好连接词（也有人叫关联词）. 引导宾语从句的连接词,课本上写有三类,但从学习的角度看分为四类更为实用. 1．连词that：只起连接作用,在从句中不作句子成分,也无词汇意义,在口语中或非正式文体中常被省略.例如： 1）He knew（that）he should work hard． 2）I am glad（that）you"ve passed the exam． 2．连词whether或if：它们起连接作用,在从句中不作句子成分,作“是否”解,口语中多用if.例如： 3）Do you know whether he will ride here at 8 tomorrow morning?（注：2002上海市徐汇区中考试题填上答案后的句子.以下再有这种例句,都为2002年中考题,只写某地.） 4）Tom didn"t know if／whether his grandpa liked the present． 作“是否”解的if和whether在具体用法上差别较大,同学们不易掌握.在宾语从句中用whether没有用if时受到那么多限制.例如： 5）He asked me whether or not I was coming．他问我是否要来.（该句中的whether不能换成if,因为if不能与or连用.） 3．连接代词who,whom ,whose,what, which：它们起连接作用,作句子成分,各有其自己的意义.例如： 6）The teacher asked the new student which class he was in?（武汉市）（which引导宾语从句,在从句中作定语,修饰class,意为“哪个”.） 7）Can you tell me whom he is waiting for?（天津市） 4．连接副词when,where, why,how：起连接作用,分别作时间、地点、原因、方式状语,各有其自己的意义.例如： 8）I wonder where he got so much money．对他从哪里弄到那么多钱我感到疑惑.（where在从句中作地点状语,修饰got,意为“哪里；什么地方”.） 9）He didn"t tell me how old his friend was．（四川省）（how引导宾语从句,作程度状语,修饰old,意为“怎样；如何”等意.） 第二关,牢记宾语从句的语序是陈述句语序,即“连接词＋主语＋谓语＋其他”.这里特别强调的是,它的主语和谓语的语序是陈述句的语序,不是疑问句的倒装语序.例如： 10）You must remember what your teacher said．（河南省） 11）—Dad,do you know when the football game will start? —In half an hour．（宁波市） 12）汉译英：你能不能告诉我,我们去看望谁? 误：Can you tell me who（m）do we have to see? 正：Can you tell me who（m）we have to see? 错句的错误出在宾语从句中误用了疑问句的结构——主语前加了个助动词do.因为我们已经习惯了特殊疑问句,如W hat time does the plane arrive in Paris?就顺口说出“Do you know what time does the plane arrive in Paris?”这种错误句子来.但是一旦我们注意了,我们不久就习惯于说“Do you know what time the plane arrives in Paris?”了. 第三关,注意时态的呼应. 宾语从句中谓语动词的时态,常常受主句谓语时态的制约,这种现象称为“时态的呼应”.例如： 13）汉译英：我原以为你今天有空的. 误：I thought（that）you are free today． 正：I thought（that）you would be free today． 错句中宾语从句用are很可能是因为有 today,但因为主句谓语是thought,所以从句谓语就该用过去将来时would be了. 这种时态的呼应,如果主句谓语是现在时或将来时,宾语从句的谓语时态不受限制,如上述例句2）,3）,7）,8）,10）,11）,12）.如果主句时态是过去时,宾语从句一般要随着改为相应的过去时（即一般过去时、过去进行时、过去完成时、过去将来时等）.例如： 14）He thought he was working for the people． 15）I heard she had been to the Great W all． 16）John hoped that he would find a job soon． 但宾语从句如果表示定理法则、永恒真理等,则不变化： 17）The teacher told us that the earth moves around the sun 定语从句 定语从句 内容提要 定语从句是由关系代词和关系副词引导的从句,其作用是作定语修饰主句的某个成分,定语从句分为限定性和非限定性从句两种.状语从句分为时间状语从句,结果状语从句,让步状语从句,原因状语从句,条件状语从句以及行为方式状语从句.名词从句包括主语从句,宾语从句,表语从句和同位语从句及there be句型. 一、 限定性定语从句 1. that即可代表事物也可代表人,which代表事物；它们在从句中作主语或宾语,that在从句中作宾语时常可省略关系词,which在从句中作宾语则不能省略.而且,如果which在从句中作“不及物动词＋介词”的介词的宾语,注意介词不要丢掉,而且介词总是放在关系代词which的前边,但有的则放在它原来的位置 2. which作宾语时,根据先行词与定语从句之间的语义关系,先行词与which之间的介词不能丢 3. 代表物时多用which,但在带有下列词的句子中用that而不用which,这些词包括all, anything, much等,这时的that常被省略 4. who和whom引导的从句用来修饰人,分别作从句中的主语和宾语,whom作宾语时,要注意它可以作动词的宾语也可以作介词的宾语 5. where是关系副词,用来表示地点的定语从句 6. when引导定语从句表示时间 〔注〕值得一提的是,表示时间“time"一词的定语从句只用when引导,有时不用任何关系代词,当然也不用that引导 By the time you arrive in London, we will have stayed there for two weeks. I still remember the first time I met her. Each time he goes to besiness trip, he brings a lot of living necessities, such as towers, soap, toothbrush etc. 7. whose是关系代词,修饰名词作定语,相当于所修饰成分的前置所有格 8. 当从句的逻辑主语是some, any, no, somebody, anybody, nobody, something, anything, everything或nothing时,常用there is来引导 二、非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明,通常和主句间用逗号隔开,将从句拿掉后其他部分仍可成立 1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分 2. 在引导限定性定语从句时,that有时相当于in which, at which, for which或at which Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed. 人们对白日做梦的态度正在改变,这与人们对夜间做梦的看法的变化有非常相似之处. I like the music for the very reason that(for which) he dislike it. 我出于某种原因喜欢这种音乐,而他恰恰与我相反. We arrived the day that(on which) they left. 刚好我们到的那天他们走了. 3. 有时as也可用作关系代词 4. 在非限定性定语从句中,不能用that,而用who, whom代表人,用which代表事物 希望我的回答对您有帮助,祝您学习进步,工作顺心.^_^

简介表语从句定义：在一个复合句中，从句作的是主语的表语成分。主语+连系动词+形容词作表语Theproblemiswhenwecangetapayrise.问题是什么时候我们可以得到加薪。主语+连系动词+句子作表语（表语从句）B连接表语从句的连接词有：that,what,who,when,where,which,why,whether,how,whoever，whomever，whichever，whatever等。还有如because,asif,asthough等。简单的说，我认为只要有Be动词就可以称之为表语从句了。望采纳啊，这是我的认知，还望采纳！^_^

表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当。表语是说明主语的身份、性质、品性、特征和状态的词或从句，表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当，它常位于系动词（be，become，appear， seem，look，sound，feel，get，smell等词）之后。例句：I am fine. （ fine 是形容词，作表语）He is a boy. （ boy 是名词，作表语）Five plus two is seven. （ seven 是数词，作表语）We are here. （ here 是副词，作表语）He is not at home. （at home 是介词短语，作表语）My hobby is reading. （ reading 是动名词，作表语）Our duty is to make our environment better.（to make 是不定式，作表语）表语从句表语从句的引导词和主语从句的引导词有区别。主语从句的引导词包括if,但if并不引导表语从句，只有一个特例是与as连用，用as if 引导表语从句；另外，表语从句的引导词也包括as,as though,because等。此外,that在表语从句中间不可以省略。而在主语从句中，有时是可以省略的。What the police want to know is when you entered the room.警察想知道的是你什么时候进的房间。The trouble is that we are short of funds.我们的困难是缺乏资金。This is what we should do.这是我们应当做的。That"s why I want you to work there.那就是我要你在那儿工作的原因。

表语从句，就是从句做表语。比如：The question is when he can arrive at the hotel.

1.表语(一般是形容词,名词,跟在系动词(be)后面） He is tall.(tall---表语) It is water.(water) 2.表语从句(is + that/what/how/when/where 从句）当表语用的句子 The problem is (how/when to get there) 3.宾语从句( do + that/how）充当宾语的句子 I know (that she likes you) 4.同位语从句 （当同位语用的句子） Tom ,(who is the monitor),is very rude.

宾语从句:在句子中起宾语作用的从句叫做宾语从句.宾语从句分为三类:动词的宾语从句,介词的宾语从句和形容词的宾语从句.表语从句:就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当，和连系动词一起构成谓语。连接表语从句的连接词有：that,what,who,when,where,which,why,表语从句只能置于主句之后，而主句的动词只能是联系动词定语从句:定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。（注意：介词后面的关系词不能省略）主语从句定义:如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句.（从句的语序永远是陈述句）强调句型：强调修饰二字。（用助动词“do（does／did）＋动词原形，用形容词very，only，single，such,last等修饰名词或形容词来加强语气，用intheworld，onearth，atall等介词短语可以表达更强的语气（常用于疑问句)，用强调句型：“Itis（was）＋被强调的部分＋that（who）＋原句其它部分”来强调说话人的意愿，用If来表示强调，标点符号也是加强修饰的方式。）明白没?

从句不能单独成句，但它也有主语部分和谓语部分，就像一个句子一样。所不同在于，从句须由一个关联词（connective）引导。 根据引导从句为主不同大概可分为：主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。前四类由于主语从句、表语从句、宾语从句及同位语从句在句子的功用相当于名词，所以通称名词性从句；定语从句功能相当于形容词，称为形容词性从句；而状语从句功能相当于副词，称为副词性从句。状语从句还可以分为条件状语从句、原因状语从句、地点状语从句和时间状语从句。 　　1.主语从句（Subject Clause）：用作主语的从句叫主语从句。引导主语从句的关联词有从属连词、疑问代词、疑问副词、缩合连接代词、缩合连接副词等。 　　2.表语从句（Predicative Clause）：用作表语的从句叫表语从句。引导表语从句的关联词与引导主语从句的关联词大都一样。 　　3.宾语从句（Object Clause）：在句子中起宾语作用的从句叫做宾语从句.宾语从句分为三类:动词的宾语从句,介词的宾语从句和形容词的宾语从句。 　　4.　同位语从句是名词性从句(主语从句、表语从句、宾语从句、同位语从句)中的主要从句之一，从句作同位语表示与之同位的名词(短语)的实际内容，它的作用相当于名词，对前面的名词(短语)加以补充说明或进一步解释，相当于一个表语从句，它们之间的关系是同位关系，即主表关系。 　　5.定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。 　　6.状语从句可分为： 　　(1)时间状语从句：(adverbial clause of time) 　　(2)地点状语从句：(adverbial clause of place) 　　(3)原因状语从句：(adverbial clause of cause) 　　(4)条件状语从句：(adverbial clause of condition) 　　(5)目的状语从句：(adverbial clause of purpose) 　　(6)让步状语从句：(adverbial clause of concession) 　　(7)比较状语从句：(adverbial clause of comparison) 　　(8)方式状语从句：(adverbial clause of manner) 　　(9)结果状语从句：(adverbial clause of result) 　　7.德语中的从句：状语从句和宾语从句均用 Dass 来引导编辑本段宾语从句定义　　宾语从句就是一个句子作动词或介词的宾语。三要素　　连接词、语序和时态。 　　连接词一般都是that(指事物或人),which（指事）,who（指人） 　　1．从句为陈述句，常选择连接词that或将that省略，直接与主句相连。 　　2．从句为一般疑问句，常选择连接词if或whether。在whether…or not结构中不能用if替换。 　　3．从句为特殊疑问句，常选择what,when,where,which,who,how等的疑问代、副词作连接词。 　　★当who为主语时，句式为：who+谓语+其他 　　判断时态情况： 　　1.主句是一般现在时，从句为各种时态情况 　　2.主句是一般过去时，从句为各种相应过去时态。注意：从句描绘客观事实，用一般现在时 　　3.主句是一般将来时，一般从句为一般现在时（“主将从现”） 　　例题： 　　（1. The teacher told the children that the sun____ round. 　　A. was B. is C. were D. are 　　选B，因其陈述为无可争议的客观事实 　　（2. I believe that our team____ the basketball match. 　　A. win B. won C. will win D. wins 选C ，这是讲话人现在对将来情况的主观推测 　　（3.The soldiers soon reached( )was once an old temple( )the villagers used as a school. 　　A.which;where B.what;which C.where;which D.what;where 　　答3：选B，动词reach后接宾语从句，从句缺少宾语，where不可，which引导宾语从句时表疑问含义“哪一个…”而此句中并非疑问含义，不知道哪一座庙宇，而是用what从句表陈述含义，意“过去的一座旧庙宇”；te-mple后为对其修饰的定语从句，用关系代词which代替，并在从句中作动词used的宾语，use sth. as…“把…用作… 　　宾语从句，在复合句中作宾语，位于及物动词后； 　　Tell him which class you are in ． 　　Do you know what he likes？ 　　(1)主、从句时态一致： 　　主句谓语过去时，从句相应过去时； 　　He answered that he was listening to me. 　　主句谓语现在时，从句时态任所需； 　　He says (that) he will leave a message on my desk. 　　They know (that) he is working hard. 　　具体过去永不变，真理格言现在时； 　　He told me that he was born in 1980. 　　Father told me that practice makes perfect . 　　（2）否定前移，及完成反意问句； 　　在think / believe / suppose / guess / imagine / expect等动词后跟宾语从句否定式时，应转移到主句上去，完成反意疑问句时，应与从句主、谓保持一致。（注: 否定前移的条件是，主句主语是第一人称） 　　I don"t think you are right ,are you ? 　　I don"t believe they have finished their work yet,have they ? 　　（3）在表示建议suggest , advise 　　要求demand 、desire、require、request、propose； 　　决定 decide; 命令 order、command; 坚决主张 insist; 　　等动词后跟宾语从句，用（should）+v．（虚拟语气） 　　eg． I suggested that you（should）study hard． 　　He ordered that we should go out at once． 　　（4）如果宾语从句后有宾语补足语，用it作形式宾语，把宾语从句后置 　　eg．You may think it strange that he would live there． 　　（5）宾语从句that常可省略，但在以下情况下不能省略 　　A．当主句谓语动词带有两个或两个以上宾语从句时，可以省略第一个that，其他不能省略。 　　eg．I believe（that）you have done your best and that things will get best? 　　B．当it作形式宾语时 　　eg．She made it clear that she had nothing to do with him． 　　C．当宾语从句前置时 　　eg．That our team will win，I believe．分类　　A 、作动词的宾语: 　　eg．I heard the news 　　I 主语　heard 谓语动词　the news.名词作宾语 　　I主语　heard 谓语动词　that he would come here later on.一个句子作宾语---宾语从句 　　B 、作介词的宾语: 　　eg．He said nothing about this plan 。 　　He主语　said 谓语动词　nothing 代词作动词的宾语 about 介词 the plan. 名词作介词的宾语带有宾语从句的复合句的构成　　带有宾语从句的复合句就是用连接词把一个主句和一个宾语从句连接在一起。连接词有：that(可省略)，what, who, when, where, why, which, if, whether, how. 　　注意　　A 宾语从句必须用陈述语序。 　　False: He is wondering when can he finish this difficult job. 　　Right: He is wondering when he can finish this difficult job. 　　B 有时候可以用it 作形式宾语，而把真正的宾语从句放在后面。 　　Bad: I thought that he could finish this　job in just two hours impossible. 　　Good: I thought it impossible that he could finish this job in just two hours.　 　　Bad: He left whether we should continue this project to my judgment. 　　Good: He left it to my judgment whether we should continue this project. 　　C 带有宾语从句的复合句的否定形式一般是否定主句。 　　Bad: I think he doesn"t like the English teacher. 　　Good: I don"t think he likes the English teacher. 　　D　False: He wanted to know why he is crying in the corner. 　　Right: He wanted to know why he was crying in the corner. 　　4.同位语从句（Appositive Clause）： 与先行词同位或等同的从句叫作同位语从句。其关联词多为that。 　　5.定语从句（Attributive Clause）：用作定语的从句叫定语从句。定语从句一般皆放在被它所修饰的名（代）词之后，这种名（代）词就叫作先行词（Antecedent）。引导定语从句的关联词为关系代词(或称引导词、关系词等）。关系代词在定语从句中可用作主语、宾语、定语等；关系副词在定语从句中用作状语。 　　①引导定语从句的关联词有who, whom, whose, that, when, where, why 和 which. 在非限制定语从句中, 只可用which, who, whose, where , when., 如果指代前面整个句子, 多用which. 　　例句： 　　The dog that/which was lost has been found.　（失踪的狗已经找到了。） 　　Those who are in favor of the proposal are expected to discuss it in detail after the meeting.　（有人认为那些对这个提案有兴趣的人最好是在会后再具体讨论它。） 　　There are many organizations whose purpose is to help the homeless.　（存在着许多旨在帮助无家可归者的组织。） 　　The days when we had to rely on wool, cotton or silk for our clothes have now passed.　（那种必须依赖羊毛，棉花或者蚕丝做衣服的日子已经过去了。） 　　Air moves from places where the pressure was high to places where the pressure is low.　（空气从压强高的地方流向压强低的地方。） 　　This is the reason why he refused to help us.　（这就是他拒绝帮助我们的原因。）

表语从句是在复合句中作表语的名词性从句。 放在系动词之后,一般结构是“主语+系动词+表语从句”基本用法 表语从句只能置于主句之后，而主句的动词只能是联系动词。 名词性从句在be等系动词后作表语时被称为表语从句 。1、可以接表语从句的连系动词有be, look, remain, seem等。★ At that time, it seemed as if I couldn"t think of the right word anyhow.当时,我似乎怎么也想不出一个恰当的字眼来。 引导表语从句的词： 2、从属连词that、whether、as though、 as if（That引导表语从句时，在口语中，间或可以省略。） that在引导表语从句时无词义，而whether有词义，意为、“是否”。这时主句的主语常常是些抽象名词，如question(问题)，trouble(麻烦)，problem(问题)，result(结果)，chance(可能性)，suggestion(建议)，idea(想法)，reason(理由)等。表语从句对主句主语进行说明、解释，使主语的内容具体化。 例如： ★ What she couldn"t understand was that fewer and fewer students showed interest in her lessons. 我们不能理解越来越少的学生对他的课不感兴趣。3、关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等；关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等引导表语从句，在句中作主语、宾语、表语，关系代词不能省略。 例如： ★ The question is which of us should go.问题是我们哪一个应该去。 4、关系副词when, where, why, how, however, whenever, wherever等。 关系副词 when, where, how, why 除在句子起连接作用外，在从句中还充当时间，地点，方式或原因状语，本身具有词义。 例如： ★Go and get your coat. It"s where you left it. 去把雨衣拿来。就在你原来放的地方。注意：A. 表语从句一定要用陈述语序。B. 不可以用if，而用whether 连接表语从句(as if 例外）。 引导宾语从句时可以互换if/whether 位于介词后要用whether 位于句首时要用whether。 引导表语从句，主语从句，同位语从句时要用whether。C.不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。D. that在表语从句中不可以省掉。

根据从句语法功能的不同可分为:主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。前四类由于主语从句、表语从句、宾语从句及同位语从句在句子的功用相当于名词，所以通称名词性从句；定语从句功能相当于形容词，称为形容词性从句;而状语从句功能相当于副词，称为副词性从句。状语从句还可以分为条件状语从句、原因状语从句、地点状语从句、目的状语从句、让步状语从句、比较状语从句、方式状语从句、结果状语从句和时间状语从句。状语从句由从句担任的状语，在句子中可修饰谓语（或其它动词)、形容词、副词或是整个句子，它可以用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步等。状语从句是一较大的语法项目，也是近几年高考题中常见的一个重要试点。高考中己考查了时间、让步、地点、条件、目的等状语从句，这些从句仍是今后高考热点，应作充分准备。同时对方式状语从句也应引起重视。

表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当。表语是说明主语的身份、性质、品性、特征和状态的词或从句，表语常由名词、形容词、副词、介词短语、动名词、不定式、从句来充当，它常位于系动词（be，become，appear， seem，look，sound，feel，get，smell等词）之后。例句：I am fine. （ fine 是形容词，作表语）He is a boy. （ boy 是名词，作表语）Five plus two is seven. （ seven 是数词，作表语）We are here. （ here 是副词，作表语）He is not at home. （at home 是介词短语，作表语）My hobby is reading. （ reading 是动名词，作表语）Our duty is to make our environment better.（to make 是不定式，作表语）表语从句表语从句的引导词和主语从句的引导词有区别。主语从句的引导词包括if,但if并不引导表语从句，只有一个特例是与as连用，用as if 引导表语从句；另外，表语从句的引导词也包括as,as though,because等。此外,that在表语从句中间不可以省略。而在主语从句中，有时是可以省略的。What the police want to know is when you entered the room.警察想知道的是你什么时候进的房间。The trouble is that we are short of funds.我们的困难是缺乏资金。This is what we should do.这是我们应当做的。That"s why I want you to work there.那就是我要你在那儿工作的原因。

表语从句（Predicative Clause）就是用一个句子作为表语。说明主语是什么，由名词、形容词或相当于名词或形容词的词或短语充当表语。表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、形容词、副词、介词短语、不定式、动词的-ing、从句来充当，它常位于系动词（be, become, appear, seem,look,sound,feel,get,smell等词）之后。如果句子的表语也是由一个句子充当的，那么这个充当表语的句子就叫做表语从句。

表语是用来说明主语的特征、状态等，补充说明主语的意义，因此，它也叫作主语补语。表语一般用在连系动词后面，连系动词除了be之外，还有become（成为）、look（看起来）、turn（变成）、go（变成）、seem（似乎）、appear（似乎、显得）、feel（摸起来）、sound（听起来）、smell（闻起来）等等。可做表语的有:形容词、代词、名词、分词、动名词、数词、介词短语或副词和从句：例如：Wearestudents.Heisveryclever.表语从句：表语从句在句中作表语，位于主句中的系动词之后，如：Thequestioniswhocancompletethedifficulttask.问题是谁能完成这项艰巨的任务。表语从句还可用asif引导。Helookedasifhewasgoingtoimpresseverythingintheroomintohismind.他看上去是要把屋里的一切都印入脑海分析表语从句的文章：http://gaokao.ewstudy.com/xtfx/2007/08/2007-08-295056.html你自己看吧