牛津譯林版八年級上冊Unit 8 Natural disasters課件(第4課時)(共17張PPT)

1、 Unit 8Natural disasters第4課時What were you doing when its raining yesterday?I was reading at home.一、過去進行時1. 定義過去進行時表示過去某一時刻正在進行的動作或過去某一階段一直在進行的動作。eg：I was reading in the library at that time. 那時我正在圖書館看書。2. 構成過去進行時由“was/were現(xiàn)在分詞”構成。am，is的過去式是was；are的過去式是were。【注意】3. 句式變換一般疑問句及回答: Was/Were主語v. ing形式其他？肯

2、定回答：Yes，主語was/were. 否定回答：No，主語wasnt/werent. eg：Were you watching TV at home at 9 oclock yesterday evening?昨天晚上9點你在家看電視嗎？Yes，I was. / No, I wasnt. 是，我是。/不，我不是。否定句:肯定句變否定句時在was/were 之后加not，was not常縮寫為wasnt，were not ?？s寫為werent。eg：I was not/ wasnt reading in the library at that time. 我那時不在圖書館看書。特殊疑問句：疑問

3、詞was/ were主語 v. ing形式其他？例如：What were you doing at that time? 你那時在干什么？二、when、while和as的用法when/ as后的動作可以是短暫的也可以是延續(xù)的，while后只能是延續(xù)的。短暫性動詞延續(xù)性動詞表示不能延續(xù)的動作，即動作發(fā)生后立即結束表示動作發(fā)生后可以持續(xù)一段時間如：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讓我們回到when、while和as的用法中。以過去時態(tài)為例，如下表所示：短暫性動詞延續(xù)性動詞表示不能延續(xù)的動作，即動作發(fā)生后立即結束表示動作發(fā)生后可以持續(xù)一段時間如：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主從句動作關系引導詞時態(tài)例句同時發(fā)生, 主句動作發(fā)生的時候, 從句動作正在進行when；while；as主: 一般過去時從: 過去進行時The earthquake happened while/ as we were having class. 同時進行while主: 過去進行時從: 過去進行時I was reading a book while he was sleepi

6、ng. 主從句動作關系引導詞時態(tài)例句從句動作發(fā)生的時候，主句動作正在進行when主: 過去進行時從: 一般過去時When I came back home, he was sleeping. 從句動作表示主句動作發(fā)生的背景as主: 一般過去時從: 一般過去時As the day went on, the weather got worse. 主從句的動作發(fā)生有先有后時，只用when，如：When I got to the museum，the door was closed. 當我趕到博物館時，門已經關上了。(got to后發(fā)生)【補充】一、用所給詞的適當形式填空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、單項選擇6Jenny _ in the kitchen when you called her at 5 oclock this afternoon. (廣東)A. is cooking B. was cooking C. cooks D. cookedB【點撥】本題用題眼法。根據時間狀語從句when you called her at 5 oclock this afternoon可知是表示過去的某一時間點，故句子用過去進行時，故選B。7. She _ to an English program while her parents _ TV.(蘭州 )A. was listening; is watching B. listened; were watchingC. was listening; watched D. was listening; were watchingD【點撥】本題用題眼法。題干中的while為連詞“當?shù)臅r候”，引導時間狀語從句。句意：當她父母在看電視時，她在收聽英語節(jié)目。while可用于表示過去某一時間內同時發(fā)生的兩個動作，綜合分析可知選D。8. What did the teacher say just now?Sorry, I didnt hear it. I _ out of the window. (荊州)A.