Unit8 Grammar 课件 2022-2023学年牛津译林版八年级英语上册

学习目标学习本课时新单词及短语：break,breakdown,onthesideoftheroad13学会使用when,while和as。学会使用过去进行时。2

GrammarUnit8Naturaldisasters

过去进行时的基本用法

P123表示过去某一时刻正在进行的动作以及过去某一阶段一直在进行的动作,常与表示过去的具体时间等连用，如：thismorning,thewholemorning,allday,yesterday,fromninetoten,lastevening,atthattime，atthistimeyesterday，at9lastnight,atthatmoment。或者在when,while,as引导的时间状语从句中使用。现在进行时am/is/are+doing过去进行时was/were+doing(现在分词）Iwassleepingat10p.m.lastnight.否定句：Iwasnotsleepingat10p.m.lastnight.

一般疑问句：WasIsleepingat10p.m.lastnight?课堂学习学习---过去进行时肯定句：Yes,Iwas.

/No,Iwasn’t.answercomeborrowrunbeginchangebuycelebratechatcutkeepdrinkcarrythinkwritepractisewinshopexercisedanceswimlieseeingingingingingingingingingingingingingingningningningtingtingmingpingyinging动词的现在分词----v-ing大多数动词直接加ing以不发音的e结尾的动词，去e加ing重读闭音节要双写结尾的辅音字母加ingwasreadingweredoingwashavingwaswalkingWerewaitingwasringingP97多么可怕的一场暴风雪呀！在路边出故障，坏掉when,while和as的用法P123（八大点）

1）when,while和as这三个词均有“当……时候”的意思Therewerefewer

sandstorms

whenmygrandparents

were

young.

我祖父母年轻时沙尘暴要少些。WhileMilliewaswatchingTV,hermumwassleeping.米莉在看电视时她妈妈在睡觉。IsawatrafficaccidentasIwasridingtoschoolthismorning.今天早晨我骑车上学时看见一起交通事故。2）when和as既可以指某一点时间，也可以指某一段时间，其从句谓语动词表示的动作既可以是瞬间性的，也可以是延续性的；while指一段时间，从句中的谓语动词必须是延续性的。即：指一段时间时，when，while和as都可用；指一点时间时，只能用when或as，不能用while。试比较：When/As

hewokeup,itwaseighto'clock.

(

✔)Whilehewokeup,itwaseighto'clock.

(

×

)When/While/AsIwaswaitingforabus,I

mether.

(

✔

)3）when引导的从句的谓语动作可以在主句谓语动作之前，之后或同时发生；While和as引导的从句的谓语动作必须是和主句谓语动作同时发生。Whenhefinishedhishomework,heplayedthecomputergamesforawhile.当他完成作业后，他玩了会儿电脑游戏。(finished先发生)WhenIgottothemuseum,thedoorwasclosed.当我赶到博物馆时，大门已经关上了。(gotto后发生)While/AsIwassleeping,thetelephonerang.当我睡觉时,电话响了。(

was

sleeping

和rang同时发生)4）当主句、从句动作同时发生且从句动作为延续性动词时，when、while和as都可使用。When/While/Asshewasmakingaphonecall,Iwaswritinganemail.

当她在打电话时,我正在写一封电子邮件。(make为延续性动词)When/While/Aswewerereading,astrangercamein.当我们正在看书时，一位陌生人走了进来。(read为延续性动词)5）强调两个动作同时进行，常用“过去进行时+while+过去进行时”结构。如：Theywererowingboatswhilewewereclimbingthehill.当我们在爬山时，他们在划船。6）强调某个动作发生的时候，另一个动作正在进行，常用“一般过去时+while+过去进行时“结构。如：Itbegantorainheavilywhilewewerehavingdinner.

我们在吃晚饭时，开始下起大雨。7）强调某个动作正在进行时，另一个动作突然发生，常用“过去进行时+when+一般过去时”结构。如：Iwaswalkinginthestreetwhenhecalledme.

我正在街上走时，他突然喊我。8）

当主句、从句动作同时进行，从句动作的时间概念淡化，而主要表示主句动作发生的背景或条件时，只能用as。这时，as有“随着……”；“一边……，一边……”之意。Asyearsgoby,Chinaisgettingricherandstronger.随着时间一年一年过去，中国变得越来越富强了。Thelittlegirlssangastheyplayed.小姑娘们一边玩，一边唱。WhenarrivedwasgettingWhen/While/Aswerebuildingwastakingfellwhen/while/aswasmakingwashidingwhenhitWhen/While/AswereplayingranP98I.用所给动词的适当形式填空We______________(mop)thefloorwhilethey___________(play)gamesatthattime.2.—______you_______(make)asnowmanthistimeyesterday?

—No,we_____________.3.Mysisterwithherclassmates_____________(take)photosfrom2to3yesterdayafternoon.4._________they___________(discuss)theproblemwitheachotherwhentheteacher___________(come)in?5.—When________you___________(see)Tom?

—I__________(see)himwhileI______________(get)offthetrain.weremoppingwereplayingWeremakingweren’tweretakingWerediscussingcamedidseesawwasgetting课堂达标II.单选1.I________amealwhenyou_____me.A.cooked;wereringingB.wascooking;rangC.wascooking;wereringingD.cooked;rangB2.Hesaidhe____todrawaplaneontheblack-boardatthattime.A.triesB.triedC.wastryingD.willtry3.She_______TVwhileherbrother________supper.A.waswatching;washavingB.watched;washavingC.watched;hadD.waswatching;hadCA4.They______afootballgamefrom7to9lastnight.A.werewatchingB.watchC.watchedD.arewatching5.Whatbook____you_____whenI______youatfouryesterdayafternoon?A.did;read;wasseeingB.did;read;sawC.were;reading;sawD.were;reading;wasseeingACⅢ.完成句子1.昨天晚上迈克来的时候我正在做作业。

I____________myhomeworkwhenMike______lastnight.2.安迪正在看电视时，她父亲回来了。

WhileAndy_____________TV,herfather___________home.3.我敲门的时候你在干什么？

Whatwereyoudoing________I_