if用法归纳

◇特别提醒

1. if作为“是否”的用法初二课本暂时没有涉及，只作拓展之用。

2. 以下内容只作了解，现行牛津初中教材内容已经删除。

在表示某一情形总会出现相同的结果时，if从句和主句都用一般现在时。

If the engine gets too hot, it starts to smoke. 发动机过热就会开始冒烟。

3. if在虚拟语气中的用法为高中内容，比较复杂，在此不作涉及。

◇课本例句

1. If you eat my food, I won’t talk to you. (P58)

2. If I don’t have food, I will die. (P58)

3. I f I don’t have food, I will die too. If I die, no one will look after you. (P58)

4. If hunters catch a giant panda, they will kill it for its fur. (P60)

5. If farmers cut down trees and forests, giant pandas will have nowhere to live. (P60)

6. If people find baby pandas alone, they will often take them away. (P60)

7. If we do nothing, soon there will be no giant pandas in the world! (P60)

◇词典例句

1. If we miss the last bus, we’ll have to walk home.

2. If it rains, we’ll have to go indoors.

3. If I have enough money next year, I will go to England.

4. What shall we do if it rains tomorrow?

5. She asked me if I was fond of music. 她问我是否喜欢音乐。

6. Can you tell me if they’re planning to come? 你能告诉我他们是否打算过来吗？

7. I don’t know if she’s coming. 我不知道她是否会来。

8. She asked me if I could go to the party. 她问我能不能去参加聚会。

◇相关词组

☆if you want/like 如果你愿意的话

You can come and stay with us if you want.

☆if so如果是的话

Are you planning to return to work, and if so, who is going to look after the baby? ☆if not如果不是的话

Has anyone dealt with the technical problems? And if not, why not?

☆if necessary/if possible 如果必要/可能的话

We are ready to fight for our rights if necessary.

I should like to be back here by 10:30 if possible.

☆even if即使

I’d rather never sell this painting, even if they offered me a million dollars.

☆what if 要是……，那怎么办？如果……那会怎样？

What if the boss walked in here now and saw us?

☆as if好像是……

She always talks to me as if she was my sister.

◇相关练习

动词填空：

1. If it ______ (be) sunny tomorrow, I ______( walk) to school .

2. We ________ (not have ) our sports meeting if the weather ____ (not be ) fine.

3. If it _______ (rain ), my father _____ (take ) me to school in his car .

4. Tigers _______ (hunt ) for their own food if they _____ (live) in the wild.

5. If wolves ________ (be) in the wild, they ______(live) as family groups.

6. If we don’t help the wild animals in danger, they ______ (die) soon.

单项选择：

( )1.I don’t know if he ______ tomorrow . If he _______, I will tell him about it .

A. will come; will come

B. comes ; comes

C. comes; will come

D. will come ; comes

( ) 2. If Simon ______ hard, he ______ good at English.

A. work; is

B. works; is

C. works; will be

D. will work; will be

( ) 3. He will come ________ you ask him.

A. whether

B. unless

C. if

D. while

( ) 4. If the phone _______, can you answer it ?

A. rings

B. is ringing

C. will ring

D. rang

( ) 5. Please give me a ring if you _______next Sunday.

A. won’t go

B. don’t go

C. not go

D. not to go

( ) 6.Do you know if his school _____a sports meeting next month.

A. hold

B. holds

C. to hold

D. will hold

( ) 7.We are not sure if it ______tomorrow. If it ______, we won’t climb the South Hill.

A. will now, snows

B. will snow, will snow

C. snows, snows

D. snows, will snow

( ) 8. If we do nothing, there_________ no more giant pandas.

A. will have

B. will has

C. will be

D. will be going to have ( ) 9. There_________ elephants if we don’t protect them.