牛津译林版八年级英语上册《Natural disasters》PPT课件(第4课时)，共18页。
What were you doing when it's raining yesterday?
I was reading at home.
一、过去进行时
1. 定义
过去进行时表示过去某一时刻正在进行的动作或过去某一阶段一直在进行的动作。
eg：I was reading in the library at that time.
那时我正在图书馆看书。
2. 构成
过去进行时由“was/were＋现在分词”构成。
3. 句式变换
一般疑问句及回答: Was/Were＋主语＋v. ing形式＋其他？
肯定回答：Yes，主语＋was/were.
否定回答：No，主语＋wasn't/weren't.
eg：—Were you watching TV at home at 9 o'clock yesterday evening?昨天晚上9点你在家看电视吗？
—Yes，I was. / No, I wasn't. 是，我是。/不，我不是。
否定句:
肯定句变否定句时在was/were 之后加not，was not常缩写为wasn't，were not 常缩写为weren't。
eg：I was not/ wasn't reading in the library at that time.
我那时不在图书馆看书。
特殊疑问句：
疑问词＋was/ were＋主语＋ v. ing形式＋其他？
例如：What were you doing at that time?
你那时在干什么？
二、when、while和as的用法
when/ as后的动作可以是短暂的也可以是延续的，while后只能是延续的。
课堂练习
一、用所给词的适当形式填空
1．We ____________ (make) a snowman from 3: 00 to 4: 00 yesterday afternoon.
2．Amy ____________ (have) lunch at 12: 00 yesterday.
3．She ____________ (watch) TV at home at this time yesterday.
4．Mr White __________ (take) a walk when it started to rain.
5．He __________ (read) a newspaper while his brother was watching TV.
二、单项选择
6．Jenny ________ in the kitchen when you called her at 5 o'clock this afternoon. (广东)
A. is cooking B. was cooking C. cooks D. cooked
7. She ________ to an English program while her parents ________ TV.(兰州 )
A. was listening; is watching B. listened; were watching
C. was listening; watched D. was listening; were watching
8. —What did the teacher say just now?
—Sorry, I didn't hear it. I _______ out of the window. (荆州)
A. look B．looked
C．am looking D．was looking
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关键词：《Natural disasters》PPT课件免费下载，.PPT格式
