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1、学习好资料欢迎下载名词性从句之主语从句一、名词性从句概述：在句子中起名词作用的各种从句统称为名词性从句。根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。二、主语从句定义：在句中起主语作用的从句称为主语从句。引导主语从句的连接词主要有：单纯连词（that,whether/if）、连接代词(what,whatever,who,whoever,whom,whose,which,whichever 等)和连接副词(when,where,why,how,whenever,wherever,however 等)。1)that 引导的主语从句（1）由连词 that引导的主
2、语从句:引导词 that无含义/在句中不做成分/不可以省。例如：That you will win the medal seems unlikely.你能得奖看起来不大可能。That light travels in straight lines is known to all.众所周知，光沿直线传播。That you don t like him is none of my business.你不喜欢他不管我的事。（2）形式主语 it 替代主语从句位于句首，that 引导真正的主语从句会放到句子的后面。常用的句式主要有如下几种：1.It+系动词+形容词+that 从句。如：It is nec
3、essary that 有必要It is clear that 很清楚It is likely that 很可能It is important that 重要的是类似的形容词还有：strange;natural;obvious;true;good;wonderful;possible;unlikely;quite;unusual;certain;evident;worth-while;surprising;interesting;astonishing,etc.例如：It was really astonishing that he refused to talk to you.It is e
4、ssential that he should be here by the weekend.It seems obvious that we can not go on like this.It is necessary that you（should）master the computer.名师资料总结-精品资料欢迎下载-名师精心整理-第 1 页，共 8 页 -学习好资料欢迎下载It is important that a student learn English well.Its clear that they badly need help.It is likely that a h
5、urricane will arrive soon.知识拓展：在“It is necessary/important/surprising/strange/unthinkable/unbelievable/incredible+that从句”这类主语从句结构中，从句中谓语动词常用“（should）动词原形”，形式，即要用虚拟语气,should 可省略。例如：It is necessary that a college student(should)master one or two foreign languages.大学生掌握一两门外语是有必要的。It is strange that you
6、(should)trust Jane.很奇怪你竟然相信简。另外，需要注意的是，it 作形式主语代替主语从句时，要注意和as 引导的定语从句的区别。试比较：It was reported that the US was under the terrorist attack.As was reported,the US was under the terrorist attack.（2）常见用 it 作形式主语的复合句结构2.It+系动词+名词+that 从句如：It is a fact that 事实是It is good news that 是好消息It is a question that
7、是个问题It is common knowledge that 是常识类似的名词还有：a pity；a wonder；a good thing；no wonder；surprise等。例如：It is a mystery to me how it all happened.It is common knowledge that the whale is not a fish.It is no surprise that Bob should have won the game.Its a pity that you missed the film.名师资料总结-精品资料欢迎下载-名师精心整理-
8、第 2 页，共 8 页 -学习好资料欢迎下载3.It+be+动词的过去分词+that 从句如:It is said that 据说It is reported that 据报道It has been proved that 已证明It must be proved that 必须指出类似的过去分词还有：known;estimated;expected;believed;thought;hoped;noted;discussed;required;decided;suggested;demanded;made clear;found out,etc.例如：It is thought that h
9、e is the best player.It is estimated that the vase is 2000 years old.It has not been made clear when the new road is to be opened to traffic.It is said that he was killed in the earthquake.4.It+特殊词+that 从句。如：It seems（happened/appears/doesnt matter/makes no difference/occurred）that 如：It seems that th
10、ey will win the game.It makes no difference whether he will attend the meeting or not.It does not matter if I missed my train.It happened that I saw him yesterday.2)用连词 whether 引导的主语从句whether有含义“是否”在句中不做成分/不可以省。注意：引导主语从句，不能用if，只能用 whether。例如：Whether you like him or not is none of my business.Whether
11、 we will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn t matter too much.3)用连接代词引导的主语从句在由连接代词 who,whose,whom,which,what,whoever,whomever,whichever,名师资料总结-精品资料欢迎下载-名师精心整理-第 3 页，共 8 页 -学习好资料欢迎下载whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分.例如：What you need i
12、s more practice.What I want to know is this.Whatever we do is to serve the people.注：whatever/whoever的功用whatever,whoever在主语从句中不含疑问意义。它引导主语从句，并在从句中作主语、宾语、表语等。whatever=anything that;whoever=anyone who。要注意和 whatever,whoever引导的让步状语从句的区别。如：Whoever breaks the law should be punished.（主语从句）（Anyone who breaks
13、 the law should be punished.）Whoever breaks the law,he should be punished.（让步状语从句）（No matter who breaks the law,he should be punished.）4）用连接副词引导的主语从句用连接副词 when,where,why,how,whenever,wherever,however 等引导的主语从句从句(其连接副词有含义,在句中作状语。)例如:Where we should leave it is a problem.When they will come hasn t been
14、 made pubic.温馨提示：如果主语从句是由连接代词what,whatever,whoever等引导的，表示的是一个具体的东西或人时，这样的主语从句不能用it 作形式主语。What is worth doing is worth doing well.Whatever was said here has left us much too think.Whoever comes will be welcome.1）随堂练习1.It doesn t matter _ you turn right or left at the crossing-both roads lead 名师资料总结-精
15、品资料欢迎下载-名师精心整理-第 4 页，共 8 页 -学习好资料欢迎下载to the park.A.whether B.how C.if D.when 2.It suddenly occurred to him _ he had left his keys in the office.A.whether B.where C.which D.that 3.-We ve only got this small bookcase.Will that do?-No,_ I am looking for is something much bigger and stronger.A.who B.tha
16、t C.what D.which 4.It doesn t matter _ you pay by cash or credit card in this store.A.how B.whether C.what D.why 5._ the polluting factory will be removed from the city is,in fact,_ the citizens are glad to see.A.That;as B.As;what C.That;what D.What;that 6.I don t say I am against Jackie s plan.But
17、the problem is _he does from the serious disease soon.A.what that B.that what C.whether what D.what whether 7.“When _ leave for Japan?”“When _ leave for Japan is kept secret.”A.they will;will they B.will they;they will C.they will;they will D.will they;will they 8.They lost their way in the forest,a
18、nd _ made matters worse was that night began to fall.A.it B.which C.that D.what 9.It has come to my notice _ some of you have missed to do anything well.A.what B.which C.that D.when 10._ we are doing has never been done before.A.That B.What C.Which D.Whether 2）家庭作业：1._ as much as one-fifth of all ti
19、mber harvested is not used.A.The estimate B.The estimated C.They are estimated D.It is estimated that 名师资料总结-精品资料欢迎下载-名师精心整理-第 5 页，共 8 页 -学习好资料欢迎下载2._ some mammals came to live in the sea is not known.A.Which B.Since C.Although D.How 3._ we have achieved is attributed to the guidance of our parents.
20、A.Whoever B.Whatever C.However D.That 4._ wealthy does not necessarily mean that a man is greedy.A.For the reason that he is B.Just because he is C.The reason of being D.That he is 5.Although _ happened in this developed country sounds like science fiction,it could occur elsewhere in the world.A.whi
21、ch B.what C.how D.it 6._ she had forgotten to take her notebook.A.That occurred to her B.She occurred that C.To her that occurred D.It occurred to her that 7.I am sure that _ she said is wrong.A.which B.all C.this D.what 8.We lost our way in the forest,and _ made matters worse was that it was gettin
22、g dark.A.that B.which C.it D.what 9._ or not is still uncertain.A.Hes coming B.If he is coming C.That coming D.Whether he s coming 10.Its _ he ll be able to come.A.doubt whether B.doubtful C.doubt it D.doubtful whether 11._ he is at work in the heart of the big city or at home in the quiet suburb,Di
23、cks life is tied to machines.A.Whether B.Till C.If D.Unless 12._ he saw both surprised and frightened him.A.That B.When C.What D.Which 13._ is warm sunshine.名师资料总结-精品资料欢迎下载-名师精心整理-第 6 页，共 8 页 -学习好资料欢迎下载 A.What do we all need.B.What all we need C.What we need D.What we all need 14._ is a pity that he
24、 should feel so upset.A.What B.That C.He D.It 15._ a spoonful of soil can tell us so much about the structure and early history of the moon.A.Remarkable B.Quite remarkably C.It is remarkable that D.It is remarkable fact that 16._ you nominate will be elected.A.Who B.Whom C.Whomever D.That s 17._ boo
25、k you borrow must be returned within a week.A.What B.Which C.Whichever D.That s 18._ of us gets home first starts cooking.A.Who B.Which C.Whichever D.Anyone 19.Its known to us all _ a form of energy.A.water is B.that water is C.is water D.that water to 20.It worried her a bit _ her hair was turning
26、gray.A.whether B.that C.what D.when 21.What I say and think _ none of your business.A.is B.are C.has D have 22._ is known to us all that America is a developed country.A Which B As C What D It 23._well go camping tomorrow depends on the weather.A If B Whether C That D Where 24._ he made an important speech at the meeting was true.A.That B.Why C.What D.How 名师资料总结-精品资料欢迎下载-名师精心整理-第 7 页，共 8 页 -学习好资料欢迎下载答案：1）1-5 ADCBC 6-10 BBDCB 2)19-24 BBADBA 名师资料总结-精品资料欢迎下载-名师精心整理-第 8 页，共 8 页 -