条件状语从句ppt课件
Study hard and you will pass the exam.
===if you study hard ,you will pass the exam.
Hurry up ,or you will be late .
===if you don’t hurry up, you will be late .
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练习(1)
(D)1. 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
(B)2 . The volleyball match will be put off
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练习(3)
(C)6. I’ll go to meet you,if I _____ free then
A. would be B. will be C. am D. was
(B)7. If you
A. will listen C. listening
to the music, buy a CD. B. listen D. listened
条件状语从句
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条件状语从句常用连词:
if (如果), unless (如果不), so /as long as(只要), once (一旦), in case (万一)
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If 引导的条件状语从句(1)
引导条件状语从句最常用的连词是if, 由if引导 的条件状语从句表示在某种条件下某事很可 能发生。如:
If you ask him, he will help you. 如果你请他帮 忙, 他会帮你的。
If you fail in the exam, you will let him down.
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If 引导的条件状语从句( 2)
当主句为将来时态或具有将来意时,条件状语从句通常 要用一般现在时表示将来意义,而不能直接使用将来时 态:
【例】if bears are in danger ,they attack people.
如果熊处于危险之中,它们就会对人进行攻 击。
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学习条件状语从句应注意以下几点: (四)
(5) 条件状语从句中的省略。 Come tomorrow if (it is ) possible. 可能的话,明天来。 I will buy a DVD set if ( it is ) necessary.
I’ll stay at home if it rains tomorrow. 要是明天下雨,我就 呆在家里。
【注】有时也可见到 if you will 这样的说法,但那不是将 来时态,而是表示意愿或委婉的请求(此处的 will是情态 动词):
If you will wait for a moment, I’ll go and tell the manager t hat you are here. 请等一下,4 我去告诉经理说你来了。
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练习(4)
(C) 8. Work hard if you _____ to get a good
mark. A. wanted B. wanting C. want D. will want
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学习条件状语从句应注意以下几点:
(二)
(2) if 从句+祈使句
If you want to go ,please let me know.
If the green light isn’t on ,wait for a minute. (3) 祈使句+and/or +陈述句。相当于if的状语从句。
学习条件状语从句应注意以下几点: (一)
⑴条件状语从句中一般不使用将来时态,尽管主句使用将 来时态,而从句用一般现在时或现在完成时。 I will come to see you if I have time. 我有时间,我就来看你。 If the rain stops,I shall go out for a walk. 如果雨停了,我就出去散步。 If you know the answer ,please raise your hand. Don’t play games unless you has finish your homework . Unless you put on a coat ,you may catch a. will rain B. rains
C. rained D. is raining
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练习(2)
(C)3. Difficulties are nothing if we _____ not
afraid of them
A. will B. shall C. are
D. do
Work hard , ____C__ you may catch up with your classmates.
A. or
B.but C. and D. yet
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学习条件状语从句应注意以下几点: (三)
(4) 注意条件状语从句是经常发生和一般将 会发生的情景和事件,则主句多用一般现在 时态。
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学习条件状语从句应注意以下几点: (五)
If(如果) 引导的条件状语从句和if (是否)连接的 宾语从句的区别:
If you use your head ,you’ll find a way. 如果你动动脑子,你就会想出办法的。 I wonder if he has finished his work. 我想知道他是否完成他的工作了。
(C)4. I don’t like to be interrupted if I _____ .
A. speak B. will speak C. am speaking D. spoke
(B)5. If you _____ the book you will understand the
story better. A. will be reading B. have read C. will have read D. read