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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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