英语写作提高——名词性从句例句 一．主语从句
1、Who was responsible for the accident is not yet clear.2、Why he left so abruptly is not known to any of us.3、When he’ll be back depends much on the weather.4、Whether she comes or not doesn’t concern me.5、Wherever he once lived is well preserved.6、It is natural that they should have different views.7、It was quite plain that she didn’t want come.8、It’s a pity that he can’t swim.9、It was a fearful disappointment to your mother that you didn’t come yesterday.10、It happened that she wasn’t in that day.11、It struck me that we ought to make a new plan.12、It was rumored that he was suffering from a tone in the kidney.13、It is estimated that 25 million school lunches are sold each day.14、Where I spend my summer is none of your business.15、It’s doubtful whether the payment is legal.16、It was a question whether he should get married.17、What the professor said is of great importance.18、Whoever break the rules will be punished.19、Who killed the scientist remains a question.20、It doesn’t matter whether she will come or not.二．宾语从句
1、We never doubt that he is honest.2、I can’t imagine what made him act like that.3、Nobody can tell when she will arrive.4、Before I came downstairs I had prepared myself very carefully for what I must say.5、You must give it back to whoever it belongs to.6、I’ve heard that you’ve won a scholarship.7、I feel it a terrible thing that my mother should have to toil so endlessly.8、We are talking about whether we admit students into our club.9、He told me that he was preparing for the English test.10、Our teacher told us that light travels much faster than sound.11、Can you tell me how I can get to the zoo?
12、The doctor insists that I give up smoking.13、She remember nothing about him except that his hair is black.14、I suggest that they shouldn’t drive along the coast.15、Have you found out how wide the ditch was?
16、Tomorrow at this time we will know who is elected?
17、Everybody knows that money doesn’t grow on tree.18、The villager didn’t realize how serious the pollution was until the fish in the river died.19、She said that she would come to the meeting.20、The book will tell you what the best CEO should do.三．表语从句
1、The fact is that he didn’t notice the car until too late.2、The mystery is whether he ever went there at all.3、The question is why he likes the place so much.4、The problem is not who will go but who will stay.5、Your brother’s health is not what it used to be.6、The question is whether they will b able to help us.7、His suggestions is that we should stay calm.8、It sounds as if someone is knocking at the door.9、He looked just as he had looked ten years ago.10、That is because he didn’t understand me.11、That is why he got angry with me.12、The problem is who we can get to replace her.13、The trouble is that I lost her address.14、The questions is whether we can rely on him.15、That is because we are in need of money at that time.16、He looked as if he was going to cry.17、The reason why he has to go is the his mother is ill in bed.18、The questions is whether it is worth doing.19、The mountain is no longer what is used to be.20、The questions is what caused the accident.四．同位语从句
1、They had to face the fact that the nearest filling station is 30 miles away.2、Have you any idea how soon they are coming?
3、Obviously there was little probability that they would succeed, but they didn’t mind.4、The suggestion that the new rule be adopted came from the chairman.5、There is a feeling in me that it is going to rain.6、The proposal has been put forward that the flight should be cancelled.7、The government gave an order that all the house should be pulled down in three weeks.8、We haven’t settled down the question where we are going to spend our summer vocation.9、There is no doubt that he will keep his promise.10、Many British parents hold the view that teenagers shouldn’t spend too much time online.11、The thought that they could cross the whole continent was exciting.12、I’ve come to the conclusion that it was unwise to do that.13、They expressed the wish that she accept the award.14、The question whether it is right or wrong depends on the result.15、The rumor spread that a new school would be built here.16、The questions who should do the work require consideration.17、The suggestion that the new rule be adopted came from the chairman.18、The news that oil price will go down is untrue.19、The question why so many animals died suddenly in that area remains unsettled.20、We have no scientific proof for the idea that time travel is impossible.12、
名词性从句
主语从句、表语从句、宾语从句和同位语从句，它们在复合句中的功用相当于名词，因此称为名词性从句，在句中分别作主语、表语、宾语和同位语。1．When he will come is still unknown.2．I don’t know who has watered the fields.3．The problem is that we need more money.4．Have you heard the news that our team won the game?
1． 主语从句：在复合句中作句子主语的从句。引导词：连词that、whether;疑问代词who, what, which;疑问副词when, where, how, why(1)连词that（无词意）, whether(是否), 在从句中不担任句子成分，只起连接作用;whether能引导主语从句，而if不能。
That you don’t like him has nothing to do with me.Whether John will do this experiment remains a question.（2）疑问代词who, what, which, 在从句中既作连接词又充当主语、宾语、表语、定语等。
Who will be sent abroad to further his studies is not announced.What surprised me most was that such a little girl could play the violin so well.Which school will win the prize is not known.Whose dictionary has not been found is still unknown.Whichever you take will be yours.Whoever wants this book may take it.Whatever was said here must be kept secret.(3)疑问副词when, where, how, why在从句中充当时间状语、地点状语、方式状语、原因状语
When they will start hasn’t been decided yet.Where the heroine went is not mentioned at the end of the story.How he managed to finish the composition in such a short time is still a mystery.Why he often comes here is known to us all.(4)用it作形式主语的主语从句常用的句型有： It’s said that… It is certain that…
It seems/ happens that…
It’s possible/ important/ necessary/ clear that…,该句型从句的谓语动词使用虚拟语气形式：should+动词原形。
It is necessary that we should learn some English grammar.2.表语从句：在复合句中作句子表语的从句
引导词有that, whether, what, which, who, whom, whose, when, where, why, how, because等（1）引导表语从句的that不省略，that仅起连接作用，在从句中不充当任何成分，无任何意义
The impression he makes on me is that he is a reliable person.(2)the reason后面的表语从句只能用that引导，我们学生易犯“the reason is because…”的错误
The reason why the little actress has been such a success is that she is both clever and hard-working.(3)在表示命令order等，建议suggestion, advice等的名词后的表语从句中，谓语动词要用虚拟语气：
should+动词原形，should可省略
His suggestion is that we(should)hold another meeting to discuss the problem.(4)whether可引导表语从句，表“是否”，它在从句中不充当成分，if不能引导表语从句。
The question is whether we can rely on him.(5)连接代词what, which, who, whom, whose除起连接作用外，还在从句中做主语、宾语、表语和定语。
That’s what he is worried about.（在从句作中宾语）
The problem is who can do the work.（在从句中作主语）
（6）连接副词when, where, why, how起连接作用外，还在从句中作状语。That’s why I was late.That is where he was born.That is how he did it.(6)连词because引导表语从句，只用在 That/This/It is because…结构中 That is because she often works hard.3．宾语从句：从句在句中充当宾语的成分。宾语从句可作谓语动词的宾语，也可作介词的宾语，也可作动词不定式等非谓语动词形式的宾语，还可作某些形容词的宾语从句。Jenny thought(that)her teacher was unfair.I’d like to know which one is your husband.I am sure(that)he won’t mind.It all depends on whether they will support us.4.同位语从句：一般跟在某些名词后面，用以解释或说明前面的名词的内容。经常带同位语从句的名词有fact, news, message, doubt, possibility, idea, reason, belief, hope, thought, promise, suggestion, question等。引导词有连词that, whether；连接代词who, which, what和连接副词where, when, why, how等（1）that, whether只起连接作用，不在从句中作任何成分。The idea that England stands for fish& chips…is past.There is no doubt that the price of cars will go down.The problem whether we should continue to do the experiment has been solved.(不能用if)(2)连接代词who, which, what和连接副词where, when, why, how在从句中作相应成分。He can’t answer the question how he got the money.The question who should go abroad requires consideration.I have no idea which one I should choose.I’ve got a pretty good idea why they left early.The question where we should go has not been discussed.I have no idea when Jack will be back.同位语从句与定语从句的区别：
We expressed the hope(that)they had expressed.我们表达了他们曾经表达过的那种希望。（定语从句）
We expressed the hope that they would come to visit China again.我们表示希望他们再来中国访问。（同位语从句）
1）从语法角度上看，引导同位语从句的that是连词，只起连接作用，在从句中不作任何句子成分；而引导定语从句的that是关系代词，除起连接作用外，还在从句中作主语或宾语等句子成分。
2）从语义角度上看，同位语从句与前面的名词hope是同位关系，表示hope的内容是they would come to visit China again。因而同位语从句是名词性的，其功能是对名词作补充说明；而定语从句与它前面的名词是所属关系，表示“…的”（他们曾经表示过的），起修饰作用，因此定语从句是形容词性的，其功能是修饰先行词。
3）同位语从句的连词that不能省略，而定语从句的关系代词that，当其在从句中作宾语中，可省略，作主语也不可省略。
I’ve heard the news that he visited our factory.I’ve heard the news that he told you the other day.The news that the plane would take off on time made everybody happy.The news that is spreading around the airport is that a heavy storm is coming.The suggestion that students should learn something practical is worth considering.The suggestion that they are considering is that students should learn something practical.
2007年高考试题单项选择语法分类汇编
十二.名词性从句
1.____ matters most in learning English is enough practice.[2007 全国卷II]
A.What B.Why C.Where D.Which
2.______ he referred to in his article was unknown to the general reader.[2007 上海卷]
A.That B.What C.WhetherD.Where
3.The traditional view is ______ we sleep because our brain is “programmed” to make us do so.[2007 上海卷]
A.when B.why C.whetherD.that
4.Could I speak to———is in charge of International Sales ,please? [2007 山东卷]
A．anyoneB．someoneC．whoeverD．nomatter who
5.You can only be sure of_________ you have at present;you cannot be sure of something _____ you might getin the future.[2007 安徽卷]
A.that;whatB.what;/C.which;thatD./;that
6.—Where’s that report?
—I brought it to you ____you were in Mr.Black’s office yesterday.[2007 北京卷]
A.ifB.whenC.becauseD.befor
7.It is none of your businessother people think about you.Believe yourself.[2007 福建卷]
A.howB.whatC.whichD.when
8.Having checked the doors were closed , and _________ all the lights were off, the boy opened the door to his bedroom.[2007 湖南卷]
A.whyB.that
[2007 江苏卷]
A.what B.why C.how10.parents say and do has a life-long effect on their children.[2007 陕西卷]
A.ThatB.WhichC.WhatD.As
you read．[2007 上海春]
A．that B．what C．which D．whether
12.The seaside here draws a lot of tourists every summer.Warm sunshine and soft sands make ________ it is.[2007 天津卷]
A.whatB.whichC.howD.where
13.Why not try your luck downtown, Bob? That’s ______ the best jobs are.[2007 浙江卷]
A.whereB.whatC.whenD.why
名词性从句
名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。因此，名词性从句厅分为主语从句、表语从句、宾语从句和同位从句。一．引导名词性从句的连接词
1、连接代词：who, whose, whom, what, which。有词义，在从句中担任成分，如主语、表语、宾语、或定语等。
2、连接副词：when, where, why, how。有词义，在从句中担任成分，作状语。
3、连接词：that, whether, if, as if。that 无词义，在从句中不担任成分，有时可省略；if(whether), as if虽有词义，但在从句中不担任成分。
注意：连接代词与连接副词在句中不再是疑问句，因而从句中谓语不用疑问式。连接代词与连接副词在从句充当句子成分，连接词whether 和if（是否），as if（好象）在从句中不充当句子成分，只起连接作用。根据句义，如果连接代词与连接副词，whether、if 和as if都用不上时，才用that作连接词（that本身无任何含义）。二.名词性从句的分类如下
（一）主语从句
主语从句的句型.引导词有疑问词wh-及whether/if及that.1、主语从句在复合句作主语。疑问词引导e.g.Who will go is not important.2、用it作形式主语，主语从句放在句末。
3、If/whether 引导e.g.It doesn’t matter so much whether you will come or not.4．It+be+adj(obvious,true,natural,surprising,good,wonderful,funny,likely,certain,probable,etc)/名词词组（no wonder,an honor , a good thing,a pity,etc)+that从句 e.g.It’s certain that she will do well in the exam/It’s no surprise that our team has won the game.5．It+be+过去分词（said,reported,thought,expected,decided,announced,etc)+that从句
e.g.It’s said that Mr.Green has arrived in Beijing.Note:that引导主语从句时，在口语和非正式文体中可以省略，但that从句置于开头时不能省略。e.g.That he suddenly fell ill last week made us surprised.（二）表语从句
表语从句的句型及要点。引导词疑问词wh-及whether及that.1、表语从句在复合句中作表语，位于系动词之后。疑问词引导的： e.g.The question was who could go there.Note: 引导表语从句的连接词that一般不可省去。
e.g.My idea is that we can get more comrades to help in the work.连接词that一般不能省略，但当主句中含动词do的某种形式时，that可以省略。如： What I want to do is(that)I can go up to him and thank him.我想做的事是走到身边去感谢他
（三）宾语从句
宾语从句在复合句中作宾语。引导词有疑问词wh-及whether、if(if 和whether 有区别）及that.引导宾语从句的连词that一般可省略。e.g.I hope(that)everything is all right.Note:以下情况that不可省略：(不考查）
1.当宾语从句的主语是that时。2.2.当宾语从句中含有主从复合句时 Father promised that I studied harder he would take me to Beijing.3.当两个或多个宾语从句由并列连词连接时，除第一个从句中的that可以省略外，其余从句中的that都不可以省略。
4当that偶尔作except和in的宾语时。This book is unsatisfactory in that it lacks a good index.中，that it lacks a good index就是介词 in 的宾语从句，这当中的that就不能省略。
（四）同位语从句。引导词wh-及whether及that.同位语从句引导词有疑问词wh-及whether及that.同位语从句在句中作某一名词的同位语，一般位于该名词（如：news, fact, idea, suggestion, promise等）之后，说明该名词的具体内容。e.g.I have no idea when he will be back.The fact that he had not said anything surprised everybody.名词性从句易混知识归纳
易混点一 ：同位语从句与定语从句的区别
that引导的从句，是定语从句还是同位语从句，我们我们采用“试加 法”，来判断。The fact that he had not said anything surprised everybody.This is the fact that you must know clearly.1.when、where、why引导的从句
引导定语从句时，其意义与先行词有关，与先行词的意义基本相同，没有疑问意义；但引导同位语从句时，其意义完全与疑问词相同，即when表示什么时候，where表示哪儿，引导两种从句时，都在从句中做状语。如： I still remember the day when I first came to Beijing.句中的when相当于“on the day”它没有疑问词“什么时候”的意义，因此是定语从句。
I have no idea when she will be back.when与idea毫无意义上的关联，其意思是“什么时候”,因而是同位语从句。易混点二：reason后面的名词性从句
reason做主语时，后面的表语从句表示原因是要用that引导，一般不用because或why，而用it，this或that做主语时，后面的表语从句可用because或why引导。
1.“The reason +连系动词+that“引导的表语从句。本句型的意思是：理由是：。。。The reason was that he fell ill.2.It（或This、That）+连系动词+the reason+why引导的定语从句。本句型意为：这就是。。。的原因（理由）That is the reason why he failed in the contest, 3.It（或This、That）+连系动词+the reason+because引导的表语从句。本句型意为：这是因为。。。；这是由于。。。的缘故。That was because he fell ill.4.It（或This、That）+连系动词+why引导的表语从句。本句型意为：这就是。。。的原因。
That was why he fell ill.易混点三：what、whatever、who、whoever等引导的名词性从句 我们可以通过与定语从句的转化知道两组在意义上的差别。Whatever=anything that（无论什么）Whoever=anyone who（无论谁）
Whenever=any time=no matter when（无论何时）Wherever=any place=no matter where（无论何地）这都是泛指。而what、who、when、where则是特指。如： Who spoke at the meeting is unknown The person that spoke at the meeting is unknown.Whoever breaks the law will be punished.Anyone who breaks the law will be punished.注意：1.whatever、whoever、whenever、wherever等常引导主语从句、宾语或表语从句，也可以引导状语从句，等于“no matter +疑问词”。而no matter +疑问词只能引导让步状语从句。Eg：Whatever I said/No matter what I said, he wouldn’t listen to me..2whoever的宾格还是whoever，一般不用whomever。易混点 whether与if（不做考查）
二者都可以作“是否”讲，能引导名词性从句，都不能省略。1.在及物动词后引导宾语从句时可以互换；
注意：在某些动词后（如:discuss）只能接whether，不能跟if。如： We discussed whether we should close the shop.2.引导主语从句、表语从句、同位语从句时都用whether，不用if。如：
The question whether he should come himself or send another man hasn’t been decided.Whether he will win is all the same to me.The question is whether you can go there yourself.但如果主语从句是有It用作形式主语，if和whether都可以 It is unknown whetherif she is ill.3宾语从句中，如果whether后紧跟or not，不用换做if；若whether与or not分开使用，则可以换作if。如： I wonder whether or not he has arrived at the destination.I don’t know whetherif I can come or not.4.若宾语从句为否定结构，则多用if，而不用whether。如： I don’t care if he doesn’t show up.（炫耀）
5.在介词后引导宾语从句或与带to的动词不定式结合而构成不定式的复合结构时，只能用whether，而不用if。如：
I haven’t settled the question of whether I will go back home.She doesn’t know whether to get married now or wait.练习：名词性从句
1.Do you see _____ I mean? 2.Tell me_____ is on your mind.3.We must stick to _____ we have agreed on.4.Let me see _____I can repair the radio or not.5.Keep in mind _____ the teacher said 6.Could you advise me _____ book I should read first? 7.He was criticized for _____ he had done.8.Would you kindly tell me _____ I can get to the Beijing Railway Station? 9.Mrs.Smith was very much impressed by _____ she had seen in China.10.We took it for granted ___ they were not coming.11.I really don’t know _____ I should do next.12.I’m afraid _____ the little girl will have to be operated on.13.She walked up to _____ I stood.14.Can you tell me _____ that gentleman is? 15.We’ll give you _____ you need.16.They want us to know _____ they can do to help us.17.We must put _____ we have learned into practice.18.Did she say anything about _____ the work was to be done yesterday? 19.He was never satisfied with _____ she had achieved in her work.20.These photographs will show you _____ our village looks like.21.Peter insisted _____ he pay the bill for the dinner.22.They urged _____ the library open during the vacation.23.We wish we could have learned _____ you did when we were at high school.24.1 will describe to you _____ I saw when I go there.25.From _____ 1 know of him I should say he is a good worker.26.I will give this dictionary to __ wants to have it.27._____ they will come here hasn’ t been decided yet.28._____ was said here must be kept secret.29.It is still a question _____ we shall have our sports meet.30.It is strange _____ she have left without saying a word.31.It is very clear _____ our policy is a correct one.32._____ Mr Zhang said is quite right.33.It’s a great pity _____ we won’t be able to finish the task on time.34._____ you have done might do harm to other people.35._____ leaves the room last ought to turn oft the lights.36._____ the 2008 Olympic Games were held in Beijing is known to all.37._____ fails to see this will make a big mistake.38.__ we need more equipment is quite obvious.39.Has it been announced _____ the planes are to take off? 40._____ is troubling me is _____ I don’t understand _____ he said 41.Things were not _____ they seemed to be.42.They are just _____ I want to have.43.That is _____ we decided to put the discussion off.44.My suggestion is _____ we should send a few comrades to help them.45.The idea _____ all people are selfish is wrong.46.We heard the news _____ our team had won.47.The fact _____ he hadn’t said anything surprised us all.48.We must keep in mind the fact _____ China is still a developing country.高考真题 2011–2013年高考
1._______ Barbara Jones offers to her fans is honesty and happiness.2.The message you intend to convey through words may be the exact opposite of _____ others actually understand.3.I’m afraid he’s more of a talker than a doer, which is _____ he never finishes anything.4.We’ve offered her the job, but I don’t know _____ she’ll accept it.5.It was never clear _____ the man hadn’t reported the accident sooner.6.Modern science has given clear evidence _____ smoking can lead to many diseases.7.When the news came ____ the war broke out, he decided to serve in the army.8.Before a problem can be solved, it must be obvious ____ the problem is.9.I’d like to start my own business—that’s _____ I’d do if I had the money.10.The villagers have already known ____ we’ll do is to rebuild the bridge.11.It is still under discussion _____ the old bus station should be replaced with a modern hotel or not.12.To show our respect, we usually have to take our gloves off _____ we are to shake hands with.13.Our teachers always tell us to belive in _____ we do and who we are if we want to succeed.14.There is clear evidence_____ the most difficult feeling of all to interpret（表达）is bodily pain.2012年高考
1.We can not clear ____ the president can do to end the strike.2.The notice came around two in the afternoon _____ the meeting would be postponed.3.I made a promise to myself _____ this year, my first year in high school, would be different.4.We promise _____ attends the party a chance to have a phone taken with the movie star.5.The limits of a person’s intelligence, generally speaking, are fixed at birth, but ____ he reaches the limits will depend on his environment.6.It doesn’t matter____ you turn right or left at the crossing-both roads lead to the park.7.The newcomer went to the library the other day and searched for ____ he could find about Mark Twain.8.As many as five courses are provided, and you are free to choose _____ suits you best.9._____ he had left keys in the office was known to us..10.Evidence has been found through years of study ___ children’s early sleeping problems are likely to continue when they grow up.2013年高考
1.I have no idea ____ the cell phone isn’t working, so could you fix it for me? 2.____ you said at the meeting describes a bright future for the company.3.____ struck me most in the movie was the father’s deep love for his son.4.From space, the earth looks blue.This is ____ about seventy-one percent of its surface is covered by water.5.____ I want to tell you is the deep love and respect I have for my parents.6.______ one of you breaks the window will have to pay for it.7.The only way to succeed at the highest level is to have total belief ___ you are better than anyone else on the sports field.8.It’s good to know___ the dog will be well cared for while we’re away.9._____ makes the book so extraordinary is the creative imagination of the writer.10.Police have found ____ appears to be the lost ancient statue.名词性从句翻译练习
1.你不喜欢他与我无关 2.汤姆已经回来了这很清楚 3.纸是中国首先造出来的这是事实。4.你要的是两个苹果吗？ 5.老师问我们是否知道王芳在那里。6.我叔叔说他很快就会回来 7.他说的话没有一句是真的。8.这取决于你是否想做这件事。9.我为什么迟到的原因是我在半路上遇到塞车了。10.她的头发变白了使她有点担心。11.他们就何时何地举行这次多国会议达成了一致意见。
12.你们的任务是在六点钟以前想尽一切办法找些吃的回来,否则，今晚我们就得挨饿。13.我对你们学英语的建议就是多读，多听，多写。14.我们必须面对这个事实即我们已经花光了所有的钱。
15.他要医院给他做出解释的要求是合理的 16.他问我买小提琴花了多少钱。17.你想象不到他们在收到这份精美的礼物时有多么激动。
18.问题是我们应该做什么来帮助他。19.你同意我们后天去旅行的计划吗？20.什么时候，怎样回家那是他自己的决定。21.哪一只球队会取胜还不一定。22.三天后，我们听到了这样的消息我国有发射一颗人造卫星。23.任何对此事视而不见的（ignore / fail to do）人将回铸成大错。
24.运动会这个星期或是下星期开都没有关系。25.我们现在做的以前从来没有做过。36.你能告诉我这本字典是属于谁的吗？
高中名词性从句讲解与练习
参考答案 名词性从句
1~5 DBABD 6~10 DBBCA 11~15 CABCC 16~20 BADAB 21~25 CDAAA 26~30 CCCDB 31~35 ABCDB 36~40 BDACD 41~45 BCDBB 46~50 ADBAC 51~55 CCBDA 56~60 ADABB 61~65 ACDBA 高考题：2011：BDDCACCADCABDD 2012：DBCCB ADADD 2013: BCCCD CBDBD 1.That you don’t like her has nothing to do with me..2.It was very clear that Tom had returned 3.It is the fact that paper was first made in China 4 4.Are what you want two apples
名词性从句包括：
主语从句
表语从句
宾语从句
同位语从句
• The question is who can complete the difficult task.• He has no idea what a remarkable woman Mary is.• That she was able to come made us very happy.• He objected that it was impossible.一、主语从句
1、主语从句在复合句中作主句的主语
That she was chosen made us very happy.What caused the accident is a complete mystery.Whoever comes to the party will receive a present.【注】 “that”在主语从句中不作任何成分，但放在句首时不能省略。
2、问：怎么才能 that 不放在句首呢？
答：有时为了使句子结构平衡，避免“头重脚轻”，常用it作形式主语，而把从句放在后面。
It depends on the climate whether they are going shopping today.试试看：新产品销售得好不好取决于它的质量和价格。
It作形式主语的几种结构：
1、It+ be +形容词+ that从句
It is strange that he knows nothing about it.2、It+ be +名词+ that从句
It is a pity that they have failed in the match.3、It+动词+宾语+ that从句
It depends on its quality and price whether a new product sells well.4、It+动词的被动结构+ that从句
It is still unknown which team will win the match.作文常用句式：
1、It turned out that…结果是„
2、It has been proved that…已经证明„
3、It is well-known that…众所周知„
4、It must be pointed out that…必须指出„
二、表语从句
1、表语从句在复合句中作主句的表语
The reason is that you don’t trust her.This is where I disagree.例：The reason ____ we didn’t trust him is ______ he has often lied． reason 后面的表语从句只能用that 引导, 不能用because 引导, 但reason后面的定语从句可以用why。
2、表语从句不能用if引导，但可用as if引导。例如： He looked as if he was going to cry.三、宾语从句
宾语从句在复合句中作主句的宾语，宾语从
句一般放在动词、介词或形容词后。
She explained that she was late because of the heavy traffic.【注】
① 有时要用it作形式宾语，而把宾语从句放在句子的后面。He has made it clear that he will not give in.①
如do you think/believe/suppose/expect/imagine后接特殊疑问词引
导的宾语从句，疑问词要放在句首。
What do you think is going on outside? ③
I/We(don’t)think/believe/suppose/expect/imagine后接宾语从句
时，反义疑问句要与从句中的主语和谓语保持一致。
I don’t suppose he cares，does he? ④ 在宾语从句中，引导词whether和if基本一样，但介词后的宾语
从句多用whether。
It all depends upon whether we can get their cooperation.⑤ 动词doubt如用于肯定句，其后的宾语从句常用if/whether引导，如用于否定句或疑问句，则宾语从句用that引导。
I doubt if/whether our football team will win the match.I don’t doubt that I can defeat him in the contest.四、同位语从句
在主从复合句中作同位语的从句称为同位语从句。同位语从句常放在fact, news, idea, truth, hope, problemin, formation 等名词后面，用以说明该名词的具体内容。
The news that they had won the game soon spread over the whole school.
引导同位语从句的关联词用that时，不能省略，不能用which替代
1.引导词that与what的区别
what从句中作句子成分(主语、宾语、表语等)what=all that/everything that that引导的主语从句放在句首时，不能省略
What we can’t get seems better than what we have.That a new teacher will come to teach us geography is true.2.引导词if和whether的区别
whether或if均可表示“是否”的情况如下：
引导宾语从句。例如：
I wonder whether/if the news is true or not. 只能用whether不能用if表示“是否”的情况：
在表语从句中。例如：
The question is whether the film is worth seeing. 在同位语从句中。例如：
The news whether our team has won the match is unknown.Answer my question whether you are coming. 在主语从句中。例如：
Whether we shall attend the meeting hasn’t been decided yet.如果用it作形式主语，则whether和if都能引导主语从句。
例如：It hasn’t been decided whether/if we shall attend the meeting. 用于句型“名词+as to + whether”中。例如：
There is some question as to whether the public should be told about the accident. 后面直接跟动词不定式时。例如：
He doesn’t know whether to stay or not. 后面紧接or not时。例如：
We didn’t know whether or not she was ready. 用if会引起歧义时。例如：
Please let me know if you like it.该句有两个意思 “请告诉我你是否喜欢”或 “如果你喜欢，请告 诉我”用了 whether就可以避免歧义。3.引导词who与whoever的区别
whoever引导名词性从句时，相当于anyone who或those who，它
既是从句的主语，又是主句的主语。而who只作从句的主语，它
引导的从句才是主句的主语。
Whoever has helped to save the drowning girl is worth praising.Who will be elected president doesn’t make much difference to me.4.引导词what与whatever的区别
whatever引导名词性从句时，与what差不多，只是语气上更强
些，有“任何一切„„”之意。
This is exactly what I want. It is generally considered unwise to give a child whatever he or she wants.5.同位语从句与定语从句的区别
同位语从句本身完整，定语从句不完整，因此其前的名词在定语从句中通常作主语、宾语或表语等成分。I made a promise that if anyone set me free I would make him very rich.The mother made a promise that pleased all her children.从结构看，同位语从句常由连接词that引导，虽在从句中不充 当任何成分,但不可省略。而定语从句中由关系代词引导，代替先行 词，并在从句中充当成分（主语或宾语），充当宾语时常可省略。6.It 作形式主语和it引导强调句的比较
将 “it is/was„that„”去掉后,句子仍然成立的是强调句,否则是that引导的主语从句 如：
It is a pity that you didn’t go to see the film.It is in the morning that the murder took place.It is John that broke the window.7.whoever与no matter who；whatever与no matter what whoever和whatever既可以引导名词性从句，也可引导让步状语
从句；no matter who和no matter what只引导让步状语从句。Whatever(＝No matter what)you may think，I’m going ahead with my plans.Take whatever you need and leave me alone.9.名词性从句中的语气
(1)在It is necessary/natural/important/strange…＋that从句中，从句中的谓语动词用“should＋原形动词”表虚拟语气，且should 可省略。
It is necessary that the problem should be settled at once.(2)表示“建议、命令、要求”意义的动词，后接that从句时，从句
中的谓语动词要用虚拟语气，即“should＋原形动词”，且should 可省略。
Bob’s doctor suggests that he(should)rest for a few days.(3)表示“建议、要求、命令、想法”意义的名词，后接that从句时，从句中的谓语动词要用虚拟语气：“should＋动词原形”，should可以省略。
这类名词有：advice，agreement，command，decision，demand, determination，order，preference，proposal，request，requirement等。This is our only request that this(should)be settled as soon as possible.同样，如主语是表示“建议、要求、命令、想法”意义的名词，那么that引导的表语从句中也要用虚拟语气。
Her suggestion was that they(should)carry on their conversation in French.
