牛津译林版八年级上册Unit 8 Natural disasters课件(第4课时)(共17张PPT)

1、 Unit 8Natural disasters第4课时What were you doing when its 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。am，is的过去式是was；are的过去式是were。【注意】3. 句式变换一般疑问句及回答: Was/Were主语v. ing形式其他？肯

2、定回答：Yes，主语was/were. 否定回答：No，主语wasnt/werent. eg：Were you watching TV at home at 9 oclock yesterday evening?昨天晚上9点你在家看电视吗？Yes，I was. / No, I wasnt. 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wasnt，were not 常缩写为werent。eg：I was not/ wasnt reading in the library at that time. 我那时不在图书馆看书。特殊疑问句：疑问

3、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。短暂性动词延续性动词表示不能延续的动作，即动作发生后立即结束表示动作发生后可以持续一段时间如：begin, arrive, borrow, buy, break, close, come, fall, finish, go, leave, lend, reach, receive, open, sell, start, stop如：live, r

4、un, stay, clean, play, hold, watch, teach, read, study, teach, eat, drink, write, dance, sing, smoke让我们回到when、while和as的用法中。以过去时态为例，如下表所示：短暂性动词延续性动词表示不能延续的动作，即动作发生后立即结束表示动作发生后可以持续一段时间如：begin, arrive, borrow, buy, break, close, come，fall，finish, go, leave, lend, reach, receive, open, sell, start, stop

5、等。如：live, run, stay, clean, play, hold, watch, teach, read, study, teach, eat, drink, write, dance, sing, smoke主从句动作关系引导词时态例句同时发生, 主句动作发生的时候, 从句动作正在进行when；while；as主: 一般过去时从: 过去进行时The earthquake happened while/ as we were having class. 同时进行while主: 过去进行时从: 过去进行时I was reading a book while he was sleepi

6、ng. 主从句动作关系引导词时态例句从句动作发生的时候，主句动作正在进行when主: 过去进行时从: 一般过去时When I came back home, he was sleeping. 从句动作表示主句动作发生的背景as主: 一般过去时从: 一般过去时As the day went on, the weather got worse. 主从句的动作发生有先有后时，只用when，如：When I got to the museum，the door was closed. 当我赶到博物馆时，门已经关上了。(got to后发生)【补充】一、用所给词的适当形式填空1We _ (make) a

7、snowman from 3: 00 to 4: 00 yesterday afternoon.2Amy _ (have) lunch at 12: 00 yesterday.3She _ (watch) TV at home at this time yesterday.4Mr White _ (take) a walk when it started to rain.5He _ (read) a newspaper while his brother was watching TV.was havingwere makingwas watchingwas takingwas reading

8、二、单项选择6Jenny _ in the kitchen when you called her at 5 oclock this afternoon. (广东)A. is cooking B. was cooking C. cooks D. cookedB【点拨】本题用题眼法。根据时间状语从句when you called her at 5 oclock this afternoon可知是表示过去的某一时间点，故句子用过去进行时，故选B。7. She _ to an English program while her parents _ TV.(兰州 )A. was listening; is watching B. listened; were watchingC. was listening; watched D. was listening; were watchingD【点拨】本题用题眼法。题干中的while为连词“当的时候”，引导时间状语从句。句意：当她父母在看电视时，她在收听英语节目。while可用于表示过去某一时间内同时发生的两个动作，综合分析可知选D。8. What did the teacher say just now?Sorry, I didnt hear it. I _ out of the window. (荆州)A.