if条件状语从句及其时态的用法

if 用法讲解

一、概念

连词if 的意思是“如果”“在……条件下某事才能发生”在复合句中连词if 二、用法

1. 条件状语从句通常由连词if 引导，意为“如果，假如”

将来，而应该用shall 或will 。

2. if

3. 正确区分if 引导的条件状语从句和if 引导的宾语从句。

在条件状语从句中，if 表示“ ”；而在宾语从句中，if 下面的方法区分：

1) 从句前置法：if 主句之后；而if 通顺，意义不变，则是条件从句，否则是宾语从句。

2) whether 替换法：if 引导宾语从句时，其意为“是否”不变，而if 引导条件状语从句时不能用whether 不能替换的是 从句。

注意：区分if ；而在宾语从句中，当主句是一般现在时，从句可用般过去时，从句用 。

一、单项选择 1. If you ____________ to the party, you’ll have a great time.

A. will go

B. went

C. go

D. going

2. I ____________ her the answer if she ____________ me.

A. can tell, will ask

B. will tell, will ask

C. would tell, ask

D. will tell, asks

3. — What are you going to do tomorrow?

— We’ll go to the library tomorrow if it ____________.

A. isn’t rain

B. rain

C. won’t rain

D. doesn’t rain

回顾一周学习内容，补全语言点。

网校资源 ID

巩固知识导学语言点，完成小题。

4. — Do you know when he will come back tomorrow?

—Sorry, I don’t know. When he ____________ back, I’ll tell you.

A. comes

B. will come

C. come

D. may come

5. I’ll give the book to him if he ____________ here next Sunday.

A. will come

B. comes

C. is coming

D. came

6. There ____________ an English film in our school tomorrow.

A. is going to have

B. will have

C. is going to be

D. has

7. I’ll wake you up when he ____________back.

A. will

B. is going to come

C. comes

D. come

8. The football match will be put off if it ________.

A. will rain

B. rains

C. rained

D. is rained

9. There ________ a basketball game this afternoon.

A. is going to have

B. will be

C. is going to play

D. will play

10. I won’t go if it ________ tomorrow.

A．rain B．is raining C．rains D．will rain

二、用所给词的适当形式填空

1. If you ________(feel) tired, you _________ (have) to have a rest.

2. Where ________ he ________ (see) the film if he _________(have) time?

3. If there ________ (be) fewer trees, there ________ (be) more pollution.

4. He ________ (dress) more casually if he ________ (not work) on weekends.

5. If Marcia ________ (live) alone, she ________ (keep) a pet parrot.

6. Lana ________ (buy) a new dress if the old one ________ (be) out of style.

7. The twins ________ (fight) if they________ (argue).

8. I ________ (have) a bake sale if I ________ (need) money for education.

9. Peter ________ (send) me a beautiful souvenir if he ________ (go) to Spain.

10. If Mr. Green ________ (say) I am hard- working, my parents ________ (feel) glad.

11. I ________ (go) to the beach if it ________ (not rain) this week.

12. ________they ________ (have) a match if the P.E. teacher________ (be) not busy?

13. He ________ (write) a letter to his grandparents if he ________ (get) his report card

this week.

14. If she ________ (get) up late, she ________ (not catch) the early bus.

15. Peter ________ (major) in English if he ________ (pass) the exams in Peking University.

三、完成句子

1.如果他迟到了，会发生什么事情？

What _______ ________ if he _______ late?

2. 如果努力学习，你就会取得好成绩。

If you_______ _______, you _______ _______ good _______.

3. 他如果看电视太久了，他的父母会不高兴。

If he _______ TV too much, his parents _______ _______ unhappy.

4. 如果我们为他举办生日聚会，大家都会来的。

Everyone _______ _______ if we _______a birthday party _______ him.

5. 如果明天不下雨，我会和你一起去公园的。

If it _______ _______ tomorrow, I _______ go to the park _______ you.

6. 如果她睡过头了，就会误了开会的。

She _______ _______ _______ _______ the meeting if she _______ _______.

7. 如果他有空，他会帮助你的。

If he _______ _______, he _______ _______ you.