复合句之表语从句

表语从句---名词从句之二∙在复合句中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、连接代词或连接副词等。

由从属连词引导：∙引导表语从句的从属连词主要有that,whether等。

/注意：if不能引导表语从句。

∙ The suggestion is that they should start from beginning.提出的建议是,他们从头开始。

His only requirement is that the machine run normally.他的唯一要求就是这台机器能正常工作。

What they want to know is whether he is capable of holding thatimportant post.他们想知道的是他是否有能力保住那一重要职位。

The only remaining question is whether or not we can raise the money.唯一剩下的问题是我们能否筹到这笔钱。

∙ It+系动词+表语从句”,常用于本结构的动词主要有appear,seem等。

∙ It appears that you're right.看来你是对的。

Now it appears to me that he may play an important role in settlingthe problem.在我看来,他可能在解决这个问题中起重要作用。

It seems that you are lying.看来你在撒谎。

It seems that no one knew what had happened.似乎没有人知道发生了什么事。

由连接代词引导∙引导表语从句的连接代词主要有who,what,which等。

∙ Never mind what the price is; if it is what we need, we'll buy it.多少价钱不管,如果是需要的东西,我们就买。

表语从句表语从句的定义：在复合句中作表语的从句叫做表语从句。

表语从句对主语进行解释、说明，使主语的内容具体化。

结构是“主语+系动词+表语从句”。

可以接表语从句的系动词有be, look, remain, seem等。

Eg.That is why he didin’t come.连接词：that / whether /as if /as though连接代词：who / whom / whose / which / what连接副词：when / where / why / how / because1.The question is whether we can rely on him.2.That’s because we were in need of money at that time .3.He looked as if he was going to cry .4.That’s why I was late .引导词的用法（一）that在表语从句中既不充当成分,又没有意义。

The fact is that he hasn’t yet recover from illness.The reason why he has to go is that his mother is ill in bed.引导词的用法（二）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:1. What the doctor really doubts is whethe r my mother will recover from the serious disease soon.2. The question is whether it is worth doing.引导词的用法（三）what 在表语从句中充当主语、宾语或表语，表示_什么，什么样子，或所…的（人或事）.1. The question is what caused the accident.2. That mountain is no longer what it used to be .3. What he told you was what had been discussed at the meeting.引导词的用法（四）who 在表语从句中充当主语、宾语也可用（whom)或表语，表示_谁_.1.The problem is who could do the work2. My trouble is who (whom) I can turn to.引导词的用法（五）which 在引导表语从句时,常充当_定语,表语__，表示其中哪一个。

英语中表语从句的用法归纳
1. 表语从句概说
表语从句即在主从复合句中用作表语的从句。

引导表语从句的词有连词that, whether，连接代词和连接副词以及as if, as though, because等连词：
My idea is that we should do it at once 我的想法是我们应该马上做。

The question is whether he is honest. 问题是他是否诚实。

The problem is how we can find him. 问题是我们如何找到他。

That was when I was fifteen. 这是我15岁时发生的事。

That's why I can't go with you. 那就是我不能同你一起去的原因。

It isn't as if you were going away for ever. 又不是你离开不回来了。

It is because I love you too much. 那是因为我太爱你了。

2. 两点重要说明
(1) whether 可引导表语从句，但与之同义的if却通常不用于引导表语从句；because 可引导表语从句，但与之同义的since, as, for 等也不用于引导表语从句。

(2) 引导表语从句的that通常不省略，但在口语或非正式文体中有时也可省略：
The trouble is (that) he is ill. 糟糕的是他病了。

顺便说一句，引导主语从句that通常也不能省略，但若句首使用了形式主语it，真正的的主语从句位于句末时，that有时也可省略。

表语从句讲解及专项练习概念：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”可以接表语从句的连系动词有be, look, remain, seem等。

★ The trouble is that we are short of money.困难是我们资金短缺。

★ That is why stone walls are used instead of fences around New England fields.这就是为什么在新英格兰用石头墙而不用栅栏的原因。

★ 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：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。

）关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等；关系副词when, where, why, how, however, whenever, wherever等。

※由从属连词that，whether引导的表语从句。

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：★ The trouble is (that) she has lost his money. 麻烦的事是他丢了钱。

表语从句详解一、概念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+表语从句可以接表语从句的连系动词有be, look, remain, seem等.可以接表语从句的系动词有：1.be（being,been,am,is,are,was,were)2. feel , seem , look, appear ,sound, taste , smell3. stand , lie , remain ,keep, stay4. become ,get , grow , turn ,go ,come, run, fall5. prove, turn outThe trouble is that we are short of money.困难是我们资金短缺.That is why stone walls are used instead of fences around New England fields.这就是为什么在新英格兰用石头墙而不用栅栏的原因.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：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.）关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等；关系副词when, where, why, how, however, whenever, wherever等.由从属连词that，whether引导的表语从句.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：The trouble is (that) she has lost his money. 麻烦的事是他丢了钱.The question is whether we need more ice cream.问题是我们是否还需要一些冰淇淋.The problem was that it was too valuable for everyday use.问题是它作为日常之用太贵重了.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.由关系代词引导的表语从句.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.The problem was who could do the work.问题是谁能做这项工作.That's what he is worrying about.那就是他在担心的事.That's what we should do.那是我们应该做的.由关系副词引导的表语从句.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.why I got wet t hrough. 我们既没伞也没雨衣，这是我们淋湿的原因.I had neither a raincoat nor an umbrella. That’sThat is how mice ruin many stores of grain every year.那就是老鼠是怎样每年损害大量粮食的.That is what he is worried about.那就是他所担心的.由连词because，as if/as though等引导的表语从句.It looked as if it was going to snow.看起来好像要下雪了.That's because we never thought of it.这是因为我们从未想过此事.好像他不知道答案.It seems as if he didn’t know the answer.注意A. 表语从句一定要用陈述语序.False: The question is when can he arrive at the hotel. Right: The question is when he can arrive at the hotel.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.False: The question is if the enemy is marching towards us.Right: The question is whether the enemy is marching towards us.Right: It looked as if he had understood this question.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.Right: The question is who will travel with me to Beijing tomorrow.Right: The question is why he cried yesterday.D. that在表语从句中不可以省掉.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例如：The problem is how we can get the things we need.问题是我们怎样能弄到我们需要的东西. (how 在表语从句中充当方式状语)The scissors are not what I need. 这把剪刀不是我所需要的.(what 在表语从句中充当宾语)What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本.(what在主语从句中作直接宾语, that作为表语从句的引导词在该表语从句中不充当句子成分，不能省略)That is what I want to tell you.那就是我想要对你讲的.(what在表语从句中充当直接宾语)That is why she failed to pass the exam. 那就是她考试不及格的原因.(why 在表语从句中充当原因状语)What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本.(what在主语从句中作直接宾语, that作为表语从句的引导词在该表语从句中不充当句子成分, 不能省略)That is what I want to tell you.那就是我想要对你讲的.(what在表语从句中充当直接宾语)That is why she failed to pass the exam. 那就是她考试不及格的原因.(why 在表语从句中充当原因状语)注意That is why...是常用句型, 意为这就是,,的原因/因此,,, 其中why引导的名词性从句在句中作表语, 该句型通常用于针对前面已经说明过的原因进行总结, 又如：That is why you see this old woman before you know, Jeanne. 珍妮, 这就是现在这个老太婆出现在你面前的原因.(前文提到Jeanne对老妇人显得苍老憔悴深感诧异, 说话人对她讲述了其中的原因之后，用这一句来进行概括).That is why I came. 这就是我来的原因.下面是两个与That is why...形式相似的结构, 它们与That is why...结构之间的关系要能够辨析清楚：(1)That is why...与That is the reason why...同义, 只不过从语法结构上讲, That is the reason why...中why引导的是—个定语从句, 将其中的the reason去掉则与That is why...结构一样, 例如：That is (the reason) why I cannot agree. 这就是我不能同意的理由.(2)That is because...句型中从属连词because引导的名词性从句在此作表语, 这也是个常用句型, 意为这就是为什么,,/因为,,.That is because...与That is why...之间的不同在于That is because...指原因或理由, That is why...则指由于各种原因所造成的后果, 例如：He did not see the film last night. That is because he had to help his little sister with her homework.昨天晚上他没有去看电影, 那是因为他得帮助他的妹妹做作业.(第一句话说明结果, 第二句话说明原因)He had seen the film before. That is why he did not see it last night.他以前曾看过那部电影, 因此他昨天晚上没有去看.(第一句话说明原因, 第二句话说明结果)表语从句与宾语从句的关系宾语从句和表语从句都属于名词性从句.其作用跟名词在句中的作用相同.故充当宾语的句子叫宾语从句，充当表语的句子叫表语从句.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.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 the police want to know is when you entered red 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困难是我们缺乏资金. This is what we should do这是我们应当做的.注意：从句中的疑问句用正常语序，即陈述语序. as if, as though, because也可用来引导表语从句.She seems as if she had done a great thing她看起来好像做了一件大事.It is because you eat too much是因为你吃得太多了. 单项选择1. The question is ________ we will have our sports meet next week. A. that B. if C. when D. whether2．The reason why he failed is ________he was too careless. A. because B. that C. for D. because ofA. whereB. thereC. there whereD. where there3. Go and get your coat. It’ s ________you left it4．The problem is _________to take the place of TedA. who can we getB. what we can getC. who we can getD. that we can get5. What I want to know is ______ he likes the gift given by us. A. that B. if C. whether D.不填6. The reason is_________ I missed the bus. A. that B. when C. why D. what7. That is __ ___ we were late last time. A. that B. when C. why D. what8. She looked _________ she were ten years younger. A. that B. like C. as D. as though9.—I fell sick!--I think it is _______ you are doing too much. A. why B. when C. what D. because10. The reason why he hasn’t come is ___________.A. because his mother is illB. because of his mother’s being illC. that his mother is illD. for his mother is ill11. —He was born here.-- That is _______ he likes the place so much. A. that B. what C. why D. how12.That is ______ Lu Xun once lived. A. what B. where C. that D. why13．_______your father wants to know is________ getting on with your studies.A. What; how are youB. That；how you areC. How；that you areD. What；how you are14. The trouble is__________ we are short of tools. A. what B. that C. how D. why that15. America was __________was first called India by Columbus.A. whatB. whereC. the placeD. there where16. China is becoming stronger and stronger. It is no longer_________ .A. what it used to beB. what it was used to beingC. what it used to beingD. what it was used to be17. ________he really means is ________he disagrees with us.A. What … thatB. That … whatC. What … whatD. That … what18. The energy is ________ makes the cells able to do their work. A. that B. which C. what D. such19 —I drove to Zhuhai for the air show last week.—Is that_____ you had a few days off？A. why B .what C. when D. where20 .I had neither a raincoat nor an umbrella ____I got wet through.B. That’s whyC. There’s whyD. It’s howA. It’s the reason21. See the flags on top of the building? That was ______ we did this morning. A. when B. which C. where D. what---Oh, t hat’s _____.22. --- Are you still thinking about yesterday’s game?A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited23. What surprised me was not what he said but ______ he said it.A. the wayB. in the way thatC. in the wayD. the way which句子翻译1.这就是我想做的 ___________________________________________________________________________________2.这房子正是他最需要的东西. _________________________________________________________________________3. 这就是Henry 怎样解决问题的 ________________________________________________________________________4.问题是谁能完成这项困难的任务 _______________________________________________________________________5.今天讨论的话题是未来的学校会是怎样的 ________________________________________________________________6.他迟到的原因是交通拥堵. _____________________________________________________________________________7.事实是他对我撒谎了.__________________________________________________________________________________8. You are saying that everyone should be equal, and this is _____________________________________________ . (disagree)你一直说每个人应该是平等的这就是我不同意之处.9.Your coat is still _______________________________________________ . (where) 你的外套仍然在你放的地方.10.I had neither a raincoat nor an umbrella. That is _________________________________________ through. (get) 我既没有雨衣也没有雨伞.这就是为什么我全身被淋湿的原因.11. It sounds ____________________________________________________ the door.(as if) 听起来好像某人正在敲门.12. It seems ______________________________ interested in Henry. (become) 好像伦敦所有人都变得对亨瑞感兴趣.13.The last time we had great fun was _____________________________________________________ the Water Park.(visit) 上一次我们玩得很开心的时候是我们正在参观水族公园的时候.that/what的区别1．_______your father wants to know is________ getting on with your studies.A. What; how are youB. That；how you areC. How；that you areD. What；how you are2. The trouble is__________we are short of tools. A. what B. that C. how D. why that3. America was __________was first called India by Columbus. A. what B. where C. the place D. there where4. China is becoming stronger and stronger. It is no longer_________ .A. what it used to beB. what it was used to beingC. what it used to beingD. what it was used to be5. ________he really means is ________he disagrees with us.A. What … thatB. That … whatC. What … whatD. That … what6. The energy is ________ makes the cells able to do their work. A. that B. which C. what D. such系动词分类：一、根据系动词后所跟结构，我们可以把英语系动词分为两大类：完全系动词（其后只能跟表语的动词，如be, seem）和半系动词（其后既可跟表语作系动词用法，也可跟宾语或状语作实义动词用，如look）例如：1） He looked sadly at the boy.(看着，实义动词用法) He looks a clever boy .（看起来，系动词用法）2） He looks at a clever boy.（看着，实义动词用法）在英语中，某一动词是多义词，既有实义动词用法，又有系动词用法.二、根据系动词的意义，我们把英语系动词分为四类：A．五大感官系动词 B．状态系动词C．动态系动词 D．双谓语系动词 A．五大感官系动词，描述一种感官性质.由实义感官动词变化而来，都是半系动词.1．look看起来像是，后接adj.、n.、分词、介词短语、不定式等.The girl bit her lips and looked thoughtful.这位女孩咬着嘴唇，看上去若有所思.2．smell闻起来，后接adj.分词. The flowers smell sweet. 这些花气味真香.3．sound听起来，后接分词. The music sounds sweet.这首诗听起来真悦耳.4．taste尝起来，后接分词.The apples taste very good. 这些苹果很好吃.5．Feel ①摸起来，给……感觉；②觉得，后接adj./p.p.You will feel better after a night’s sleep. 睡上一晚，你会觉得好些.B．状态系动词：1．be，是，属完全系动词. I am a student. 我是一个学生.2．seem,似乎，好像，完全系动词. They seem quite happy. 他们似乎很快乐.3．appear,显得，看起来好像，半系动词. It appeared(to be)a true story.看来这是一个真实的故事.4．keep, 保持……的状态，半系动词，后接adj或介词短语. You’d better go to bed and keep warm. 你最好躺在床上去暖和一下.5．remain,仍是，半系动词. I remained silent. 我仍然缄默.6．stay保持（某种状态），半系动词，后接adj.、过去分词. The window stayed open all the night.7.prove 证明是，半系动词，后接adj.\n.The treatment proved to be successful. 这种疗法证明是成功的.C．动态系动词：都属于半系动词，描述状态变化过程.1．get变成，变得……起来，后可接形容词、分词、介词短语.The days are getting longer and longer. 白天变得越来越长了.2．fall进入（某种状态），成为，后常接以下形容词： asleep, lame, silent, ill, sick, flat.The old men, unable to express himself, fell silent. 那位老人说不清自己的意思，就不做声了.My father fell ill and died. 我的父亲生病死了. 3．grow渐渐变得……起来，长得It’s growing warm. 天气渐渐暖和起来了.4．turn转变成（新的与原来完全不同的色彩或性质），变质（色）.Maple trees turn red in autumn. 枫叶在秋天变红了.It was cloudy this morning, but fortunately it has turned fine. 今天早上是阴天，幸好已经转晴了.5．go，变成（某种坏的状态） The telephone has gone dead. 电话不通了.The material has gone a funny colour. 这料子的颜色变得奇怪了.go之后常接的adj. 还有：bad, blind, wild, wrong, sour, hard, hungry, mad, red, with, anger, white, pale, blue, grey.6．become变成，成为（好坏均可的情况）I became interested in drawing. 我开始对素描感兴趣了. He became angry with me. 他对我生气了.They became good friends. 他们成了好朋友.7．come，变成为（已知的状态），证实为，后常接形容词或前缀un-的过去分词作表语，表示状态或情况的变化.His wish to become a pilot has come true. 他想当飞行员的愿望实现了.If you look into the matter, everything will come clear. 如果你调查一下这事，一切都会清楚.后面常接的形容词还有：apart, dear（昂贵），natural, open, short, right（好了），unstuck（没有粘住），untied（松开）. 8．run,变成，后接adj. The price ran high. 价格上升了.9．make，达到某种状态[后接形容词]，如sure, certain, merry, bold, freeWe must make certain of facts.我们一定要弄清事实.D．双谓语系动词此类系动词既有系动词的功能，后接表语，又保留原实义动词本身的含义.例如：The run rose red.太阳升起红艳艳.She stopped and stood quite still.她停下来然后一丝不动地站着. The snow lay thick on the ground. 雪厚厚地堆积在地上. He married young. 他结婚很早. Lei Feng died young.雷锋早逝. He continued silent.他继续沉默不语.系动词单项选择题①The story sounds_________________(MET 89) A. to be true B. as true C. being true D. true②Those oranges taste__________(MET 91) A. good B. well C. to be good D. to be well③---Are you feeling________? ---Yes, I’m fine now/(NMET92) A. any well B. any better C. quite good D. quite better④----Can I join the club, Dad.----You can when you _________a bit older.(NMET 94) A. get B. will get C. get D. will have got⑤---Do you like the material? ----Yes, it _______very soft.(NMET 94) A. is feeling B. felt C. feels D. is felt⑥I love to go to the seaside on Summer. It_____ good to lie in the sun or swim in the cool sea.(NMET 96)A. doesB. feelsC. getsD. makes⑦Cleaning women in big cities usually get _______by the hour.(NMET 98) A. pay B. paying C. paid D. to pay⑧Why don’t you put the meat in the fridge? It will _____ for several days.(NMET2003）A. be stayedB. stayC. be stayingD. have stayed系动词巩固练习①What you have said_______.A．is sounded interesting B sounds interesting C．sound interested D．listens interested②The class begins. Please keep________. A．silent B．silence C．the silence D．silently③Look! Several people in the crowd seemed_____. A．to be fighting B．to have fought C．being fought D．having fought④How _____the song she sings sounds! I have never ______a better voice.A．beautifully, sounded B．beautiful, sounded C．sweet, listened to D．sweet, heard⑤Her feeling about the marriage ______rather strange. A．is looked B．is seemed C．seems D．is appeared⑥The new shirt______ right. A．doesn’t feel B．isn’t felt C．isn’t feeling D．doesn’t touch⑦How happy it_______ for me to be home again after twenty years abroad! A．gives B．feels C．is felt D．is given⑧John _____driver since two months ago. A．became a B．has become a C．has turned D．has been a⑨He _____he felt very _______over the death of the boy.A．seemed that, sad B．seemed as if, sadly C．looked as though, sad D．looked that, sadness⑩The ice_____ thick on the river. A．is lain B．lay C．laid D．lie单项选择答案1~5: DBACC 6~10 :ACDDC 11~15:CBDBA 16~20: AACAB 21~23: DAA句子翻译1.This is what I want to do.2.The house is what he needs.3.This is how Henry solved the problem.4.The question is who can complete the difficult task.5.The discussion topic for today is what school will be like in the future.6.The reason why he was late is that the traffic was busy.7.The fact is that he told a lie to me.8. where I disagree9. where you put it10. why I got wet11. as if somebody is knocking at12. as if everyone in London became13. when we were visitingthat/what的区别DBAAAC系动词单项选择题1.D,2.A,3.B,4.A,5.C,6.B,7.C,8.B系动词巩固练习1——5：BAADC，6——10：ABDCB。

考点七十三表语从句表语从句放在连系动词之后，充当复合句中的表语。

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）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。

表语从句：1，定义：表语从句是指在复合句中做主句表语的从句。

表语从句和主语只同一内容，它对主语进行解释、说明，是主语的内容具体化。

2，表现形式：A 由从属连词引导The clear message is that we should get moving to protect ourselves.译：传达的信息一清二楚：我们应该行动起来保护我们自己。

The reason I didn’t go to France was that I got a new job.译：我之所以没去法国是因为我找到一份新工作。

特别提示：下列表达式不规范的：The reason I didn’t go to France was because I got a new job .因为because 不能引导名词性从句。

The question is whether he works at all.译：问题在于他是否工作。

特别提示：下列表达是错误的：The question is if he works at all .因为if不能引导表语从句。

B 有连接代词引导China is not what it used to be .译：中国不再是过去的样子了。

Raw material is what we are badly in need of .原材料是我们急需的。

C 有连接副词引导The next important question we have to decide is when we have to submit the annual report.我们必须决定的下一个问题是，是么时候我们必须呈交年度报告。

Some people maintain that this is precisely where the danger lies.有些人坚持认为这恰恰是危险所在。

This is why I didn’t pass the exam.这就是我考试不及格的原因。

初中英语二轮专项复习之表语从句用法汇总一、什么是表语从句？表语从句是一种在复合句中充当表语的从句，其作用是说明主语是什么。

它可以由名词、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。

表语从句通常放在连系动词之后，充当复合句中的表语。

二、表语从句的构成：表语从句的构成如下:主语+连系动词+表语从句例如:I am a student, and I study English every day.(我是学生，我每天都学习英语。

)主语+连系动词+表语从句+其他成分例如:The weather is very nice today, so we decided to go for a walk.(今天天气非常好，所以我们决定去散步。

)主语+连系动词+表语从句+其他成分+其他成分例如:I am very tired, so I went to bed early last night.(我非常累，昨晚早早就睡了。

)表语从句可以是名词性的，如“a student”和“English”,也可以是形容词性的，如“beautiful”和“happy”。

表语从句通常放在连系动词之后，充当复合句中的表语。

三、引导表语从句关联词种类：1. 可接表语从句的连系动词有be，look，seem，sound，appear等。

可接表语从句的连系动词有be、look、seem、sound和appear 等。

这些连系动词后面常常接名词、形容词或副词作为表语，用来说明主语的状态、特征、性质等[1]。

例如:The sky is blue.(天空是蓝色的。

)The cat looks fat.(这只猫看起来很胖。

)The sound of the music is beautiful.(音乐的声音很美妙。

) The appearance of the building is modern.(这座建筑的外观很现代。

)2. 从属连词whether，as，as if / though引导的表语从句。

表语从句的时态一、表语从句的基本概念表语从句是在复合句中作表语的从句，位于系动词之后。

例如：The problem is that we don't have enough time.（“that we don't have enough time”就是表语从句，在系动词“is”之后）二、表语从句时态的一般规则1. 主从句时态一致原则- 当主句为一般现在时，表语从句根据实际情况可以使用各种时态。

- 例如：The fact is that he has been to Paris several times.（主句是一般现在时“is”，表语从句用现在完成时，表示到目前为止的经历）- Another example: My idea is that we will go camping tomorrow.（表语从句用一般将来时，表示将来的计划）- 当主句为一般过去时，表语从句通常也用与过去相关的时态。

- 例如：His suggestion was that we should have a party last night.（主句是一般过去时“was”，表语从句用“should + 动词原形”这种特殊结构表示建议，也可以理解为一种过去将来的概念）- She said that she was reading a book at that time.（主句是一般过去时“said”，表语从句用过去进行时，表示过去某个时刻正在进行的动作）2. 客观事实与真理- 如果表语从句表达的是客观事实、真理、自然现象等，无论主句是什么时态，表语从句都用一般现在时。

- 例如：The truth is that the earth goes around the sun.（主句不管是现在时态还是过去时态，表语从句都用一般现在时“goes”，因为这是客观真理）3. 根据语境确定时态- 例如：The question is whether he will come.（这里根据问题本身是关于将来的情况，所以表语从句用一般将来时“will come”）- 如果语境是对过去事情的描述，表语从句就会用相应的过去时态。