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考点一：if 引导的条件状语从句

【考例】 If_________, I will go.

A. he doesn’t come B. he won’t come C. he will come D. he is coming

if 引导的条件状语从句。If是连词，所连接的句子 叫条件状语 从句，表示假设或条件，意思是 “ 如果…的话”，用法如下：

1、表示假设，表示将会发生和可能发生的事，或进行提醒警告。

用法：

(1)条件状语从句通常由连词if引导，意为“如果、假如”，主句不能用be going to表示将来，而应该用shall，will。 如： If you go to the party, you will meet Uncle Zhang.

I’ll ask the teacher for help if I don’t understand.

(2)if “如果”，引导条件状语从句，主句用一般将来时，从句则用一般现在时。如：

If it rains tomorrow, we won’t go there. 如果明天下雨，我们就不去那了。

(3)若主句是祈使句，if引导的条件状语从句仍用____________时态。

Put up your hand if you have any questions to ask.

注意：宾语从句中的if与条件状语从句if的区别。宾语从句中的if“是否”相当于 whether，引导宾语从句，时态需根据语境确定。

如：I don't know if it will rain tomorrow. 我不知道明天是否会下雨。

2. 表示真实条件、客观真理、自然现象、定理定义 . 民 间谚语等，句型是：

If + 句子 (一般现在时 )，+ 主句 ( 一般现在时).

例： If you study hard ,you are sure to succeed .

If you put ice in a warm place ,it turns into water .

针对练习： ( )1There is going to _________ a soccer match next sunday. If it __________, we’ll have to cancel(取消) it. a. be; will rain b. have; will rain c. be; rains d. have; rains

( )2.If she _________ harder, she will catch up with us soon.

a. study b. studies c. will study d. studied

( )3.I’m waiting for my mother. __________, i’ll go shopping alone.

a. If she comes b. If she will come

c. If she doesn’t come d. If she didn’t come

( )4.I don’t know if he __________ to the party. If he _________, I’ll tell you.

a. comes; comes b. will come; will come

c. comes; will come d. will come; comes

( )5. If you don’t go to the party this friday, __________.

a. he will, too b. he won’t, either

c. he does, too d. he doesn’t, either

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