主语从句用法和练习题

一、主语从句

在复合句中作主语的从句叫主语从句。主语从句通常由从属连词that,whether和连接代词what,who,which,whatever,whoever以及连接副词how,when,where,why等词引导。that在句中无词义,只起连接作用;连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用,在从句中充当从句的成分。例如:
What he wants to tell us is not clear.
It is known to us how he became a writer.

Where the English evening will be held has not yet been announced.

  1. 由连词that引导的主语从句: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.
    That you are so indifferent bothers me.That she survived the accident is a miracle.
    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。例如:Whether she is coming or not doesn’t matter too much.

备注:It doesn’t matter if 是固定句型。

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, 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,有意义)。
例如:What you need is more practice.      What I want to know is this.

Whatever we do is to serve the people.

*whatever, whoever, whichever引导的主语从句的区分:

Whatever 相当于anything that , 是 what 的强调形式,表示“无论什么”。

Whatever she does is right.

Whoever相当于anyone who,是who 的强调形式,表示“无论谁,任何…的人”。

Whoever walks around in such a heavy rain will catch a cold.

Whichever“无论哪个,无论哪些”,既可以指人,也可以指物,可以单独使用,可以修饰名词,也可以后跟of短语。

Whichever book you borrow doesn’t matter to us.
4.用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。)

eg:Where we should leave it is a problem.

When they will come hasn’t been made pubic.
5. 有时为避免句子头重脚轻,常用形式主语it代替主语从句作形式主语放于句首,而把主语从句置于句末,但是不能代替由what引导的主语从句。主语从句后的谓语动词一般用单数形式。常用句型如下:
(1)It + be + 名词 + that从句      (2)It + be + 形容词 + that从句
(3)It + be + 动词的过去分词 + that从句(4)It + 不及物动词 + that 从句

另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时,谓语动词要用虚拟语气“(should) +do”,常用的句型有:
It is necessary (important, natural, strange, etc.) that …
It is a pity (a shame, no wonder, etc.) that…
It is suggested (requested, proposed, desired, etc.) that…

即学即练:

1._____they are most interested in is how they can produce more and better cars.

  1. That       B. What       C. WhenD. Whether

2.______we’ll go camping tomorrow depends on the weather.

  1. If       B.  Whether      C. That        D. Where
  2. ________ makes mistakes must correct them.
  3. What   B. That        C. Whoever     D. Whatever
  4. ______ surprised me most was that such a little boy of seven could play the violin so well..
  5. That    B. What        C. WhetherD. When
  6. ________ we go swimming every day ______usa lot of good.
  7. If…do   B. That…do   C. If…does   D. That…does
  8. It ________ Bob drives badly.
  9. thinks that B. is thought what   C. thought that      D. is thought that
  10. It‘s uncertain(不确定) ________ the exhibition will be hold in Shanghai.
  11. if        B. that         C. whether        D. how
  12. 8. It‘s certain(不确定) ________ the exhibition will be hold in Shanghai.
  13. if        B. that         C. whether        D. how
  14. 9. ________ the boy didn’t take medicine made his mother angry.
  15. That     B. What     C. How         D. Which
  16. ____ we can’t have seems better than what we have.
  17. What     B. Who    C. That        D. whose
  18. 11. ____ you don’t like him is none of my business.
  19. What  B. Who C. That D. Whether
  20. 12. _______ team will win the match is none of my business.
  21. Which     B. That      C. If         D. How
  22. 13. _________is going to do the job will be decided bythe CEO.
  23. That    B. Why      C. How       D. Who
  24. 14. _______ we’ll finish translating the book depends on the time.
  25. When    B. Why    C. What      D. That

答案:BBCB  DDCB   AACA  DA

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