高中英語(yǔ)語(yǔ)法主語(yǔ)從句講解及練習(xí)

1、精選優(yōu)質(zhì)文檔-傾情為你奉上主語(yǔ)從句一、概述：在句子中起名詞作用的各種從句統(tǒng)稱為名詞性從句。根據(jù)它們?cè)诰渲械恼Z(yǔ)法作用，這類從句又可分為主語(yǔ)從句、同位語(yǔ)從句、表語(yǔ)從句和賓語(yǔ)從句。 二.主語(yǔ)從句主要有四類：（1） 由連詞that引導(dǎo)的主語(yǔ)從句:引導(dǎo)詞that無(wú)含義/在句中不做成分/不可以省。例如：That you will win the medal seems unlikely. That you are so indifferent bothers me. That she survived the accident is a miracle.（2） 用連詞 whether 引導(dǎo)的主語(yǔ)

2、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(yǔ)從句，不能用if，只能用whether。 例如：Whether we will hold a party in the open air tomorrow depends on the weather. Whether she is coming or not doesnt matter too much.（3） 用連接代詞引導(dǎo)的主語(yǔ)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

3、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. What I want to know is this. Whatever we do is to serve the people.注：whatever / whoever的功用whatever, whoever在主語(yǔ)從句中不含疑問(wèn)意義。它引導(dǎo)主語(yǔ)從句，并在從句中作主語(yǔ)、賓語(yǔ)、表語(yǔ)等。whatever = anything that; whoever = anyone who。要注意和whatever, whoever引導(dǎo)的讓步狀語(yǔ)從句的區(qū)別。如： Whoever breaks the l

4、aw should be punished. （主語(yǔ)從句）（ Anyone who breaks the law should be punished. ） Whoever breaks the law, he should be punished. （讓步狀語(yǔ)從句）（ No matter who breaks the law, he should be punished. ）（4）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(yǔ)。)例如:Where we should leave it is a problem.When they will

5、 come hasnt been made pubic.三.注意點(diǎn): it構(gòu)成的主語(yǔ)從句（1）由連詞that引導(dǎo)的主語(yǔ)從句，在大多數(shù)情況下會(huì)放到句子的后面，而用代詞it作形式主語(yǔ)。例如：That light travels in straight lines is known to all. =It is known to all that light travels in straight lines. When the plane is to take off has not been announced . = It has not been announced when the pla

6、ne is to take off.(但當(dāng)what引導(dǎo)的主語(yǔ)從句表示“的東西”時(shí)，一般不用it作形式主語(yǔ)。)錯(cuò):It is a book what he wants.對(duì):What he wants is a book. 另外，需要注意的是，it作形式主語(yǔ)代替主語(yǔ)從句時(shí)，要注意和as引導(dǎo)的定語(yǔ)從句的區(qū)別。試比較： It was reported that the US was under the terrorist attack. As was reported, the US was under the terrorist attack. （2）常見用it作形式主語(yǔ)的復(fù)合句結(jié)構(gòu) <a&g

7、t; It is +名詞+從句It is a fact that 事實(shí)是It is good news that 是好消息It is a question that 是個(gè)問(wèn)題It is common knowledge that 是常識(shí)類似的名詞還有：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

8、 should have won the game.Its a pity that you missed the film. <b> 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

9、; surprising; interesting; astonishing, etc.例如：It is doubtful whether she will be able to come. It was really astonishing that he refused to talk to you. 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 th

10、e computer. It is important that a student learn English well. Its clear that they badly need help. It is likely that a hurricane will arrive soon.需要注意的是，這類主語(yǔ)從句中，謂語(yǔ)動(dòng)詞很多為“（should）動(dòng)詞原形”，即要用虛擬語(yǔ)氣。<c> It is +過(guò)去分詞+從句It is said that 據(jù)說(shuō)It is reported that 據(jù)報(bào)道It has been proved that 已證明It must be prove

11、d that 必須指出類似的過(guò)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 thought that he is the best player. It is estimated that the vase is 2000 years old. It is used to be thought that a new star must b

12、e due to a collision between two stars. 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. <d> It seems （happened / appears / doesnt matter / makes no difference / occurred ）that 如： It seems that they will win the game. It

13、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.四練習(xí)1. _ as much as one-fifth of all timber harvested is not used.A. The estimate  

14、60;        B. The estimated    C. They are estimated       D. It is estimated that2. _ some mammals came to live in the sea i

15、s not known.   A. Which       B. Since        C. Although      D. How 3. _ we have achieved is attributed to&#

16、160;the guidance of our parents.   A. Whoever     B. Whatever     C. However      D. That 4. _ wealthy does not necessarily mean&#

17、160;that a man is greedy.   A. For the reason that he is      B. Just because he is    C. The reason of being      

18、     D. That he is 5. Although _ happened in this developed country sounds like science fiction,  it could occur elsewhere in the world.   A. whi

19、ch        B. what       C. how           D. it6. _ she had forgotten to take her notebook.   A. 

20、;That occurred to her           B. She occurred that     C. To her that occurred           D. It occurred

21、 to her that7. I am sure that _ she said is wrong.   A. which        B. all         C. this     

22、0;      D. what8. We lost our way in the forest, and _ made matters worse was that it was getting dark.  A. that        

23、   B. which      C. it              D. what9. _ or not is still uncertain.  A. Hes coming     &

24、#160;           B. If he is coming      C. That coming                 D. Whether hes comi

25、ng10. Its _ hell be able to come.  A. doubt whether  B. doubtful     C. doubt it         D. doubtful whether 11. _ he is

26、 at work in the heart of the big city or at home in the quiet  suburb, Dicks life is tied to machines.  A. Whether       B. Till &

27、#160;            C. If            D. Unless12. _ he saw both surprised and frightened him.  A. That  

28、0;       B. When            C. What         D. Which13. _ is  warm sunshine.  A. What do we all

29、 need.          B. What all we need    C. What we need                 D. What we all need

30、14. _ is a pity that he should feel so upset.   A. What         B. That              C. He  

31、60;        D. It15. _ 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    &