Unit5 What were you doing when the rain 时间状语从句中when和while的区别（课件）

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2020年自治区教科院中小学教师
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课题：时间状语从句中when和while的区别
时间状语从句中when和while的区别
难点名称：能正确使用连词when和while,明确两者引导时间状语从句的相同及不同点
八年级-下册-Unit5 What were you doing when the rainstorm came
01.lead-in
03.practice
02.presentation
04.summary
Lead-in
when和while有什么区别呢？
延续性动词
非延续性动词
presentation
延续性动词，也叫作持续性动词，表示能够延续的动作，这种动作发生后可以一直持续下去。
非延续性动词，也叫作终止性动词、瞬间性或短暂性动词，表示不能延续的动作，即动作从发生到结束所持续的时间非常短，且大多都是动作发生后也就马上结束。
presentation
I learned English three years ago.
She gets to school by bus every morning.
这两个句子的谓语动词是延续性，还是非延续性动词呢？
presentation
延续性动词
非延续性动词
learn, work, stand, study, know, walk, keep, have, sing, read等
open, die, finish, begin, come, leave, move, go ,buy等
She borrowed this book from the library.
I learned English three years ago.
presentation
都表示“当……”，但区别是什么？
when和while引导时间状语从句
presentation
It was raining when she arrived at the station.
When you worked, I was sleeping.
非延续性动词
延续性动词
when
延续性动词/非延续性动词
时间段/时间点
时间点
时间段
presentation
从句中动作既可以与主句的动作同时发生，又可以在主句动作之前或之后发生。
while
I was doing homework while my father was watching TV.
Don’t make any noise while others are reading.
当我做作业的时候父亲正在看电视。
不要制造噪音当别人看书时。
非延续性动词
时间段/
延续性动词/
时间点
presentation
practice
用when或while填空
1. _______ we were talking in the classroom, the teacher came in.
2. _______ they got to the airport, it was raining.
3. _______ she was reading a book, the phone rang.
4. _______ I saw the boy, he was wearing a new coat. 5.Were you drawing the teacher was talking
When/While
When
When/While
While
When
延续性动词
非延续性动词
延续性动词
非延续性动词
强调两个动作同时发生
when和while引导时间状语从句
相同点
不同点
当从句中的动作为时间段，且从句动作为延续性动词时，when和while都可以使用
When引导的时间状语从句，从句中的动词可以是延续性动词也可以是非延续性动词。但是while从句中的动词必须是延续性动词。且while常强调两个动作同时发生，用进行时。
When I was taking a walk in the park, I met him.
when 和 while 可以互换
It was raining heavily when we arrived.
只能用when,不能用while
非延续性动词
summary
When god closes a door, he opens a window.
Thanks for listening, see you!