课时4 Grammar授课课件.pptx
Unit 8Natural disasters第第4课时课时第一PPT模板网-WWW.1PPT.COMWhat were you doing when its raining yesterday?I was reading at home.一、过去进行时一、过去进行时1.定义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。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。那时我正在图书馆看书。2.构成构成过去进行时由过去进行时由“was/were现在分词现在分词”构成。构成。am,is的过去式是的过去式是was;are的过去式是的过去式是were。【注意注意】3.句式变换句式变换一般疑问句及回答一般疑问句及回答:Was/Were主语主语v.ing形式其他形式其他?肯定回答:肯定回答:Yes,主语,主语was/were.否定回答:否定回答:No,主语,主语wasnt/werent.eg:Were you watching TV at home at 9 oclock yesterday evening?昨天晚上昨天晚上9点你在家看电视吗?点你在家看电视吗?Yes,I was./No,I wasnt.是,我是。是,我是。/不,我不是。不,我不是。否定句否定句:肯定句变否定句时在肯定句变否定句时在was/were 之后加之后加not,was not常缩常缩写为写为wasnt,were not 常缩写为常缩写为werent。eg:I was not/wasnt reading in the library at that time.我那时不在图书馆看书。我那时不在图书馆看书。特殊疑问句:特殊疑问句:疑问词疑问词was/were主语主语 v.ing形式其他?形式其他?例如:例如:What were you doing at that time?你那时在干什么?你那时在干什么?二、二、when、while和和as的用法的用法when/as后的动作可以是短暂的也可以是延续的,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。后只能是延续的。短暂性动词短暂性动词延续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,run,stay,clean,play,hold,watch,teach,read,study,teach,eat,drink,write,dance,sing,smoke让我们回到让我们回到when、while和和as的用法中。以过去时态为例,的用法中。以过去时态为例,如下表所示:如下表所示:短暂性动词短暂性动词延续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主从句动作关系主从句动作关系引导词引导词时态时态例句例句同时发生,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 sleeping.主从句动作关系主从句动作关系引导词引导词时态时态例句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,只用主从句的动作发生有先有后时,只用when,如:,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。当我赶到博物馆时,门已经关上了。(got to后发生后发生)【补充补充】一、用所给词的适当形式填空1We _(make)a 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【点拨点拨】本题用本题用题眼法题眼法。根据时间状语从句。根据时间状语从句when you called her at 5 oclock this afternoon可知是表示过去可知是表示过去的某一时间点,故句子用过去进行时,故选的某一时间点,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【点拨点拨】本题用本题用题眼法题眼法。题干中的。题干中的while为连词为连词“当当的时候的时候”,引导时间状语从句。句意:当她父母在看电,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。视时,她在收听英语节目。while可用于表示过去某一时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.look BlookedCam looking Dwas lookingD【点拨点拨】本题用本题用句意理解法句意理解法。根据上下文可知老师讲。根据上下文可知老师讲话时话时“我我”正在看窗外,表示过去的某一时间内正在正在看窗外,表示过去的某一时间内正在做的事情用过去进行时。做的事情用过去进行时。本本节节课课主主要要学学习习了了以以下下知知识识点点,请请同同学学们们及及时巩固练习:时巩固练习:过去进行时过去进行时when、while和和as的用法的用法PPT模板: