新人教版英语八年级下册Unit5 SectionA(Grammar Focus-4c)精品课件.ppt

初中英语人教版八年级下
Unit5 What were you doing when the rainstorm came?
Section A（Grammar Focus-4c）
Warm-up
1
Presentation
2
Language Points
3
Exercise
4
When I …
He was doing …
When I called him up, he was sleeping.
Make up the sentences.
Review
While I …
He was doing …
While I walked to school, he was eating.
When I …
He was doing …
When I read the newspaper, he was watching TV.
when和while都可表示“当……的时候”，引导时间状语从句。你知道两者在过去进行时中的用法有什么不同吗？
请仔细观察下面的例句，然后补全空格中的内容。
Presentation
① I was walking to school when I saw a cat in a tree.
②When Sally arrived home, her mother was cleaning the house.
主句的动作是持续性的，而从句动作是
短暂性的，此时用 ______ 引导时间状语从
句，主句用 __________ 时态，从句用一般
过去时态。
过去进行
when
③ While I was sleeping in the bedroom, someone knocked at the door.
④ David fell while he was riding his bike.
主句的动作是短暂性的，从句的动作
是持续性的，此时用 _______ 引导从
句，主句用 __________ 时态，从句
用过去进行时态。
一般过去
while
⑤ While Andy was waiting for the bus, he was reading a newspaper.
⑥ He was cleaning his car while I was cooking.
主句和从句的动作在过去的某时刻或某
段时间同时发生，而且动作都是持续性
的，此时用 _________ 引导从句，而且主
句和从句都用 ____________ 时态。
过去进行
while
将下列汉语句子翻译成英语。
1. 当我正在网上查找信息的时候，门铃响了。
While I was looking for information on the Internet, the door bell rang.
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