主语从句详解加练习题

（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。

That you will win the medal seems unlikely.

That you are so indifferent bothers me.

例题：1. ________ 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

2.________ we go swimming every day ________ us a lot of good.

A. If...do

B. That...do

C. If...does

D. That...does

3.____ you don't like him is none of my business.

A. What

B. Who

C. That

D. Whether

（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。

Whether she is coming or not doesn’t matter too much.

例题：1.____ we'll go camping tomorrow depends on the weather.

A. If

B. Whether

C. That

D. Where

（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).

What you need is more practice.

What I want to know is this.

例题：1.________ makes mistakes must correct them.

A. What

B. That

C. Whoever

D. Whatever

2. ________ Tom liked to eat was different from ________.

A. That…that you had expected

B. What …that you had expected

C. That…what you had expected

D. What…what you had expected

3.._______makes mistakes must correct them.

A. Who

B. Anyone

C. Whoever

D. Anybody

4..________leaves the room last ought to turn off the lights.

A. Anyone

B. The person

C. Whoever

D. Who

（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)

Where we should leave it is a problem.

例题：1._______we'll finish translating the book depends on the time.

A. When

B. Why

C. What

D. That

2.______he won't go there is clear to all of us.

A. How

B. What

C. Why

D. This

(5)注意点：it 做形式主语,而将主语从句放在句末（尤其是当谓语较短时）。

That light travels in straight lines is known to all.=It is known to all that light travels in straight lines.

例题：1.It ________ Bob drives badly.

A. thinks that

B. is thought what

C. thought that

D. is thought that

2.It's uncertain ________ the experiment is worth doing.

A. if

B. that

C. whether

D. how

1. She was so angry and spoke so fast that none of us understood _______ he said meant.

A. that

B. what

C. that that

D. what what

2. They lost their way in the forest, and _______ made matters worse was that night began to fall.

A. it

B. which

C. that

D. what

3. It is pretty well understood _______ controls the flow of carbon dioxide in and out the atmosphere today.

A. that

B. when

C. what

D. how

4. _______ she couldn’t understand was ______ fewer and fewer students showed interest in her lessons.

A. What; why

B. That; what

C. What; because

D. Why; that

5. _______ we are doing has never been done before.

A. That

B. What

C. Which

D. Whether

6. _______ she was invited to the ball made her very happy.

A. What

B. That

C. When

D. Because

7. ____ has helped to save the drowning girl is worth praising.

A. Who

B. The one

C. Anyone

D. Whoever

8. _______ medicine works in a human body is a question _______ not everyone can understand fully.

A. How; that

B. That; which

C. That; which

D. What; that

答案：C D C B C D C C A C D C D(在none of us understood what what he said meant 中，none of us understood 为主句，what what he said meant 为宾语从句，而在此宾语从句中又包括有what he said 这样一个主语从句) D C A B B D A