高中英語公開課主語從句講解練習及答案

1、主語從句 一、主語從句的連詞分三類 （1）從屬連詞引導的主語從句 （that whether if） that引導的主語從句:引導詞that無含義/在句中不做成分/不可以省。That 引導主語從句通常用it 作形式主語。 That she survived the accident is a miracle. whether有含義(是否)/在句中不做成分/不可以省。 注意：引導主語從句，不能用if不能在開頭，只能用whether。 Whether she is coming or not doesnt matter too much. （2） 用連接代詞引導的主語從句 在由連接代詞who, w

2、hose, whom, which, what, whoever, whomever, whichever, whatever引導的名詞性從句中，其連接代詞在句中起名詞性作用，擔當一定成分. 例如 Whatever we do is to serve the people. 注：whatever / whoever的功用 whatever = anything that; whoever = anyone who。要注意和whatever, whoever引導的讓步狀語從句的區(qū)別。 如：Whoever breaks the law should be punished. （主語從句） （ An

3、yone who breaks the law should be punished. ） Whoever breaks the law, 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引導的名詞性從句(其連接副詞有含義,在句中作狀語。) 頁 1 第例如:Where we should leave it is a problem. When they will come hasnt been made pu

4、bic. 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it，而將真正的主語從句移至句末。這分四種情況： (1) 對于以連詞that引導的主語從句，通常用形式主語it替代主語從句： It is +名詞+從句 It is a fact that 事實是；It is good news that 是好消息；It is a question that 是個問題；It is common knowledge that 是常識 It is common knowledge that the whale is not a fish. It is no surprise

5、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 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 +過

6、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 必須指出例如：It is used to be thought that a new star 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. 頁 2 第 It seems不及物動詞（happened / a

7、ppears / doesntt matter / makes no difference / occurred ）that 主語從句不可提前 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) 對于以連接代詞(副詞)引導的主語從句，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 w

8、as 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引導的主語從句，通常直接將主語從句放在句首。如： What we need 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

9、 true that he is the girls 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引導的主語從句直接位于句首，則that不能省略；若that引導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： 頁 3 第That you didnt 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

10、 didnt go to the talk. 很遺憾你沒去聽報告。(that可省) 主語從句練習題 1._ makes mistakes must correct them. A. What B. That C. Whoever D. Whatever 2. It worried her a bit _ her hair was turning grey. A. while B. that C. if D. for 3.When and why he came here _ yet. A. is not known B. are not known C. has not known D. ha

11、ve not known 4. _ 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 late 5. _ Tom liked to eat was different from _. A. Thatthat you had expected B. What that you had expected C. Th

12、atwhat you had expected D. Whatwhat you had expected 6._ we go swimming every day _ us a lot of good. A. If.do B. That.do C. If.does D. That.does 7.It _ Bob drives badly. A. thinks that B. is thought what C. thought that D. is thought that 8.Its uncertain _ the experiment is worth doing. A. if B. th

13、at C. whether D. how 9._ the boy didnt take medicine made his mother angry. A. That B. What C. How D. Which 頁 4 第10._ we cant get seems better than _ we have. A. What, what B. What, that C. That, that D. That, what 11._ you dont like him is none of my business. A. What B. Who C. That D. Whether 12._

14、 well go camping tomorrow depends on the weather. A. If B. Whether C. That D. Where 13._is going to do the job will be decided by the Party committee. A. That B. Why C. How D. Who 14._well finish translating the book depends on the time. A. When B. Why C. What D. That 15._he wont go there is clear to all of us. A. How B. What C. Why D. This 16._the house will be built will be discussed at tomorrows meeting. A. If B. Where C. That D. What 17. ._you come or not is up to you. A. What B. If C. Why D. Whether 18._makes mistakes must correct them. A. Who B. Anyone C. Whoever D. Anybody 19._team wil