If引导条件状语从句的用法

◆if引导的条件状语从句

条件状语从句是在复合句中作条件状语的句子。表示假如有从句的动作发生就会有主句的动作发生。条件状语从句常由从属连词if引导。

◆if引导的条件状语从句使用须知：

一、位置

if引导的条件状语从句，既可放在主句之前也可放在主句之后。当从句置于主句之前时，常用逗号与主句隔开。例如：

You will catch the bus if you get up early.

=If you get up early, you will catch the bus.

如果你早起的话，就能赶上公共汽车。

二、时态

应遵循主、从句时态呼应的原则。当主句是一般现在时(包含祈使句和含情态动词can, may, must等的句子)，从句也用一般现在时。例如：

You must see the doctor if you are ill.

如果你生病了，你必须去看医生。

If you want to go skating, wear warm

clothes.

如果你想去滑冰，穿上暖和点的衣服。

一．选择正确答案。

1. It was raining heavily___ we got to Paris.

A. while

B. if

C. when

D. because

2. I don’t know if ___ tomorrow.

A. it doesn’t rain

B. the rain will stops

C. the rains won’t stop

D. it won’t rain

3 . The volleyball match will be put off if it___ .

A. will rain

B. rains

C. rained

D. is raining

4. Difficulties are nothing if we ___ not afraid of them

A. will

B. shall

C. are

D. do

5. We ___ Beijing tomorrow if it doesn’t rain.

A. are going to

B. would

C. shall

D. will go

6. I don’t like to be interrupted if I___ .

A. speak

B. will speak

C. am speaking

D. spoke

7. If you ___ the book you will understand the story better.

A. will be reading

B. have read

C. will have read

D. read

8. If you ___ I will go with you

A. go to

B. went

C. will

D. should go

9. I’ll go to meet you，if I ___ free then.

A. would be

B. will be

C. am

D. was

10. If you ___ to the music, buy a CD.

A. will listen

B. listen

C. listening

D. listened

11. He suggested ___ a pinic tomorrow.

A. to have

B. having

C. have

D. to having

12. Be careful, if you ___ want to make mistakes.

A. won’t

B. don’t

C. didn’t

D. not

13. Work hard if you ___ to get a good mark.

A. wanted

B. wanting

C. want

D. will want

14. I want to know if you___ to the party tomorrow.

I will if I___ free.

A. will come; am

B. come; am

C. will come; will be

D. come; will be

15. The cat ___ him___ the hand.

A. bit; in

B. bited; on

C. bit; on

D. bited; on

16. There is going to ___ a sports meeting next week. If it ___ , we’ll have to cancel it..

A. be; will rain

B. have; will rain

C. be; rains

D. give; is going to rain

17. If he ___ , I ___ go swimming alone.

A. doesn’t come will go

B. won’t come; will go

C. will come; won’t go

D. is coming; don’t go

18. If you ___ a chance to study in a foreign country, just take it.

A. getting

B. had got

C. will get

D. get

19. Frank ___ a film if he’s free next Saturday.

A. see

B. saw

C. has seen

D. will see

20. If he ______ exercise, he ___ healthy.

A. not; will

B. isn’t; won’t be