主语从句讲解及练习.doc

主语从句(Subject Clause)讲解及练习 定义:在复合句中充当主语的句子叫做主语从句. 第一部分：常规主语从句，即句子在复合句中充当一个主语 主语从句的时态：不受主句的时态影响和限制。 （1）That he finished writing the composition in such a short time surprised us all. （2）Whether we will go for an outing tomorrow remains unknown. （3）Who will be our monitor hasnt been decided yet. （4） Whom we must study for is a question of great importance. （5）What caused the accident remains unknown. （6）Whatever you did is right. （7）Whose watch was lost is unknown. （8）What we need is time. （9）What we need are good doctors. 小结: （1)引导主语从句连词有that, whether, who, what, whatever等 （2)连词位于句首不能省略 （3)主语从句大多数情况下视为三单,但也有例外,如，例9。 第二部分：为了防止句子头重脚轻，通常把形式主语it放在主语位置，真正主语搁置于句末 （1）It is certain that he will win the match. （2）It is true that he has made a very important discovery in chemistry. （3）It is very likely that they will hold a meeting. （4）It is strange that he should do that. （5）It is important that we all should attend the meeting. （6）It is strange that the man should have stuck to his silly ideas. （7）It is a pity that we wont be able to go to the south to spend our summer vacation. （8）It is still a mystery what caused the accident. （9）It is said that he has gone to shanghai.(=He is said to have gone to shanghai) （10）It is known to all that the gun powder was first invented by the Chinese. （11）It is suggested that the work should be done with great care. （12）It seems that he has seen the film.(=He seems to have seen the film) （13）It happened that the two cheats were there. (=The two cheats happened to be there) 小结: （1)以that 引出的主语从句,常以形式主语it引导. It is +形容词/名词 + that 从句. （2) 在有些that从句中要用虚拟语气 (should+do / should+have done)例句4,5,6,11. 主语从句与宾语从句两者的用法和在句中的作用是不同的，下面从它们的各自用法，介绍：） 一主语从句 主语从句 定义:在句子中担当主语的是一个从句,这个从句就叫做主语从句。 主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。 1. It 作形式主语和it引导强调句的比较 It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人是也可用who/whom。例如： It is a pity that you didnt go to see the film. 2. 用it 作形式主语的结构 (1) It is 名词从句 It is a fact that 事实是 It is an honor that 非常荣幸 It is common knowledge that 是常识 (2) it is 形容词从句 It is natural that 很自然 It is strange that 奇怪的是 (3) it 不及物动词从句 It seems that 似乎 It happened that 碰巧 (4) it is过去分词从句 It is reported that 据报道 It has been proved that 已证实 3. 主语从句不可位于句首的五种情况 (1) if 引导的主语从句不可居于复合句句首。 (2) It is said , (reported) 结构中的主语从句不可提前。例如： It is said that President Jingo will visit our school next week. (3) It happens, It occurs 结构中的主语从句不可提前。例如： It occurred to him that he failed in the examination. (4) It doesnt matter how/whether 结构中的主语从句不可提前。例如： It doesnt matter whether he is wrong or not. (5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如： Is it likely that it will rain in the evening? 4. What 与that 在引导主语从句时的区别 What 引导主语从句时在从句中充当句子成分，如主语宾语表语，而that 则不然。例如： What you said yesterday is right. What he had done was proved to be wrong.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 known B. are not known C. 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 lateC. 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 expected B. What that 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.do C. 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 experiment is worth doing.A. if B. that C. whether D. how9._ 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. Who 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 must correct them.A. Who B. Anyone C. Whoe