1.Whilethelightswerechangingtored,acarsuddenlyappearedroundthecorner.2.WhenIwaswaitingtocrosstheroad,theaccidenthappened.//1.Whilethelightswerechangingtored,acarsuddenlyappearedroundthecorner.2.WhenIwaswaitingtocrosstheroad,theaccidenthappened.//StudentA:You’reapolicemanatanaccidentsceneinthestreet.Askpeoplequestions.StudentB,CandD:Yousawtheaccident.Answerthepoliceman’squestions.A:Whatwereyoudoingwhentheaccidenthappened?B:Whentheaccidenthappened,Iwaswalkingalongthestreet.C:Whentheaccidenthappened,…D:…过去进行时1.定义：表示过去某一具体时间正在发生的动作。2.时间标志：at…yesterdaymorningatthattimefromninetotenlasteveningwhen,while,ase.g.WewerewatchingTVfromsixtoninelastnight.WhatwasheresearchingalldaylastSunday?3.过去进行时还可以和when,while,as引导的过去时间状语从句连用，形成复合句。e.g.Whilethelightswerechangingtored,acarsuddenlyappearedroundthecorner.正当交通信号灯要变成红灯的时候，一辆小轿车突然从拐角处驶出来。Oneday,whenHenrywasworkinginarestaurant,asnakesuddenlyappeared.一天，当亨利正在餐馆里工作时，一条蛇突然钻了出来。Iwastryingtopickitupwhenitbitmeagain.我正试图捡起（那条蛇），突然它又咬了我一口。Asthedoctorswerecheckinghim,thepaingotworse.医生给他做检查时疼痛加剧了when，while，as都可以引导时间状语从句，但用法区别非常大。一、when可以和延续性动词连用，也可以和短暂性动词连用；而while和as只能和延续性动词连用。e.g.Theyarrivedwhilewewerehavingdinner.=Theyarrivedwhenwewerehavingdinner.我们吃饭的时候他们到了二、由when引导的时间状语从句，如果主句是过去进行时，从句应该用一般过去时，表示一个动作正在进行的时候另一个动作突然发生了，强调后一动作发生的突然性。e.g.Weweretalkingwhentheteachercamein.我们正在讲话，老师（突然）进来了三、当主句和从句的动作都是延续的或同时发生的，两句都用过去进行时的时候，多用while引导。e.g.Theyweresingingwhileweredancing.他们在唱歌，我们在跳舞。重点短语：intimefalloffpayattentionsidebyside语法：过去进行时1.Safetycomesfirst.Weshould_______tokeepsafeontheroad.①obeythetraffic(交通)rules②becarefulofpassingcarsandbuses③runfastafterothers④notreadthemessagesonourmobilephones⑤playbasketballwithourfriendsA.B.C.①②④①③⑤②④⑤AA2.I______amealwhenyou_____me.A.cooked,wereringingB.wascooking,wereringingC.wascooking,rangD.cooked,rangCC3.They_____afootballgamefrom7to9lastnight.A.werewatchingB.watchC.watchedD.arewatching4.Wouldthedriverseehim_________?A.ontimeB.intimeC.fortime5.Theoldman_________theladderyesterdayafternoon.A.felloffB.felldownC.fellofD.fellupABA6.Everyoneshouldpayattention____theriskoftheaccident.A.forB.toC.atD.underB编写一个对话,介绍你亲眼目睹的一次交通事故。
