高中主語從句講解及其練習(xí)講課稿

1、精品文檔主語從句一、主語從句的連詞分三類（1）從屬連詞引導(dǎo)的主語從句（ thatwhetherif）that 引導(dǎo)的主語從句 :引導(dǎo)詞 that 無含義 /在句中不做成分 /不可以省。 That 引導(dǎo)主語從句通常用 it 作形式主語。例如： That you will win the medal seems unlikely.That she survived the accident is a miracle.whether 引導(dǎo)的主語從句:whether 有含義 (是否 )/ 在句中不做成分/不可以省。注意：引導(dǎo)主語從句，不能用if 不能在開頭，只能用whether。Whether we

2、will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn tmatter too much.（2） 用連接代詞引導(dǎo)的主語從句在由連接代詞who, whose, whom, which, what, whoever, whomever, whichever, whatever引導(dǎo)的名詞性從句中，其連接代詞在句中起名詞性作用，擔(dān)當(dāng)一定成分.例如： What you need is more practice.Whatever we do is to ser

3、ve the people.注： whatever / whoever 的功用whatever, whoever 在主語從句中不含疑問意義。它引導(dǎo)主語從句， 并在從句中作主語、賓語、表語等。whatever = anything that; whoever = anyone who 。要注意和whatever, whoever 引導(dǎo)的讓步狀語從句的區(qū)別。如： Whoever breaks the law should be punished.（主語從句）（ Anyone who breaks the law should be punished.）Whoever breaks the law,

4、 he should be punished. （讓步狀語從句）（ No matter who breaks the law, he should be punished.）（ 3）用連接副詞 when, where, why, how 引導(dǎo)的名詞性從句 (其連接副詞有含義 ,在句中作狀語。 )例如 :Where we should leave it is a problem.When they will comehasn tbeen made pubic.精品文檔精品文檔三、 it 作形式主語的主語從句有時為了考慮句子平衡，通常在主語從句處使用形式主語這分四種情況：(1) 對于以連詞that

5、 引導(dǎo)的主語從句，通常用形式主語 It is + 名詞 +從句itit，而將真正的主語從句移至句末。替代主語從句：Itisa factthat事實是 ；Itisgoodnews that 是好消息；Itisa questionthat 是個問題；It is common knowledge that 是常識類似的名詞還有：a pity； a wonder； a good thing； no wonder ； surprise 等。It is a mystery to me how it all happened.It is common knowledge that the whale is

6、not a fish.It is no surprise that Bob should have won the game. It is + 形容詞 +從句It is necessary 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 類似的形容詞還有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite;unusual; certain; evident; worth-while; su

7、rprising; interesting; astonishing, etc.It is doubtful whether she will be able to come.It is essential 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.需要注意的是這類主語從句中，謂語動詞很多為 “（ should）動詞原形” ，即要用虛擬語氣。 It is +

8、 過去分詞 +從句It is said that據(jù)說 ； It is reported that據(jù)報道 ； It has been proved that已證明 ； It must be proved that必須指出 類似的過去分詞還有：known; estimated; expected; believed; thought; hoped; noted; discussed;required; decided; suggested; demanded; made clear; found out,etc.例如： It is used to be thought that a new sta

9、r must be due to a collision between two stars.It has not been made clear when the new road is to be opened to traffic. It seems 不及物動詞（happened / appears / doesn t matter / makes no difference /occurred ） that 主語從句不可提前精品文檔精品文檔It makes no difference whether he will attend the meeting or not.It does n

10、ot matter if I missed my train.It happened that I saw him yesterday.(2) 對于以連接代詞 (副詞 )引導(dǎo)的主語從句， 可以使用形式主語代主語從句， 也可直接在句首使用主語從句：Whether they would support us was a problem.他們是否會支持我們還是一個問題。It was a problem whether they would support us. 他們是否會支持我們還是一個問題。(3) 對關(guān)系代詞型 what 引導(dǎo)的主語從句，通常直接將主語從句放在句首。如：What we need

11、is money. 我們需要的是錢。What I want to know is this.我想知道的就是這一點。有時也可將助用形式主語。如：It is clear enough what he meant.他是什么意思很清楚。(4) 如果句子是疑問句，則必須用帶形式主語it 的結(jié)構(gòu)：Is it true that he is the girl s father? 他是那女孩的父親，是真的嗎？How is it that you are late again?你怎么又遲到了？四、連詞that 的省略問題引導(dǎo)主語從句的連詞that 有時可省，有時不能省，其原則是：若that 引導(dǎo)的主語從句直接位

12、于句首， 則 that 不能省略； 若 that 引導(dǎo)的主語從句位于句末，而在句首使用了形式主語it ，則 that 可以省略：That you didn t go to the talk was a pity.很遺憾你沒去聽報告。(that 不可省 )It was a pity (that) you didn t go to the talk.很遺憾你沒去聽報告。(that 可省 )五、六、七、八、九、十、十一、十二、主語從句練習(xí)題精品文檔精品文檔1、It never occurred to me_you could succeed in persuading him to change h

13、ismind.(陜西高考 )A whichB whatCthatD if2、 Its obvious to the students_they should get well prepared for theirfuture.(天津卷 )A asBthatCwhichD whether3 、 _some people regard as a drawback is seen as a plugby manyothers.(2010北京 )A WhetherB WhatC ThatDHow4、It is uncertain_side effect the medicine will bring

14、about， although abouttwo thousand patients have taken it.(2010浙江 )A thatB howCwhatDwhether主語從句練習(xí)題1._ makes mistakes must correct them.A. What B. That C. Whoever D. Whatever2. It worried her a bit _ her hair was turning grey. A. while B. that C. if D. for3.When and why he came here _ yet.A. is not kn

15、own B. are not knownC. has not known D. have not known4. _ is no reason for dismissing her.A. Because she was a few minutes late B. Owing to a few minutes late C. The fact that she was a few minutes late D. Being a few minutes late5. _ Tom liked to eat was different from _.A. Thatthat you had expect

16、ed B. Whatthat you had expectedC. Thatwhat you had expected D. Whatwhat you had expected6._ we go swimming every day _ us a lot of good.A. If.do B. That.doC. If.does D. That.does7.It _ Bob drives badly.A. thinks that B. is thought what C. thought that D. is thought that8.Its uncertain _ the experime

17、nt is worth doing.A. if B. that C. whether D. How精品文檔精品文檔9._ the boy didnt take medicine made his mother angry.A. That B. What C. How D. Which10._ we cant get seems better than _ we have.A. What, what B. What, that C. That, that D. That, what11._ you dont like him is none of my business.A. What B. W

18、ho C. That D. Whether12._ well go camping tomorrow depends on the weather.A. If B. Whether C. That D. Where13._is going to do the job will be decided by the Party committee.A. That B. Why C. How D. Who14._well finish translating the book depends on the time.A. When B. Why C. What D. That15._he wont go there is clear to all of us.A. How B. What C. Why D. This16._the house will be built will be discussed at tomorrows meeting.A. If B. Where C. That D. What17. ._you come or not is up to you.A. What B. If C. Why D. Whether18._makes mistakes m