外研版初中英语八年级上册 Module 8 Unit 3(共37张PPT)

Unit3LanguageinuseModule8Whilethelightswerechangingtored,acarsuddenlyappearedroundthecorner.WhenHenrywastryingtofindthesnake,hishandbegantohurtbadly.Iwastryingtopickitupwhenitbitmeagain.Readthesentencesandpayattentiontotheunderlinedparts.过去进行时（2）when和while的区别(一)when，while都有“当……时候”的意思。when既可表示某一点时间，也可以表示某一段时间。在when引导的时间状语从句中，其谓语动词可以是延续性的，也可以是非延续性的，可与主句中的谓语动词同时发生，也可在其后发生。如：Iwasjustreadingabookwhenshecameintomyroom.

她走进我房间时，我正在看书。

Wereyouwritingwhentheteachercamein?

老师进来的时候，你在写信吗？

Whenhewasachild,hewasalwaystryingoutnewideas.

他小时候就常常试验一些新的设想。(二)while只能表示某一段时间，不表示某一点时间。在while引导的时间状语从句中，其谓语动词只能是延续性的，而且也只能与主句中的谓语动词同时发生或存在。如：

WhileJimwasmendinghisbike,LinTaocametoseehim.

正当吉姆修自行车时，林涛来看他。

Youcan’tdoyourhomeworkwhileyou’rewatchingTV.

你不能一边看电视一边做家庭作业。(三)when和while的区别还在于:while引导的时间状语从句多用进行时态，而when引导的时间状语从句多用一般时态。如：

Whiletheyweretalking,thebellrang.

他们谈话的时候，上课铃响了。

Iwasdoingmyhomeworkwhenmymothercamebackhomeyesterdayevening.

昨天晚上妈妈回家的时候，我正在做家庭作。(四)when可表示“这时(突然)”；while表示“而”“却”(表示对比)

。如：IwasjustabouttogotobedwhenIheardaknockonthedoor.

我正要睡觉，听见有人敲门。Helikescoffee,whileshelikestea.

他喜欢咖啡，而她却喜欢茶。1Hewaslisteningtomusic______hewasridinghisbike.2Iwaswaitingatthelights______Isawtheboyfalloffhisbike.3Iwaswalkinginthestreet______anaccidenthappened.4Thedriverwastalkingonhismobilephone______hewasdriving.whileCompletethesentenceswithwhenorwhile.whenwhenwhile[链接]

as的意思是“正当……时候”“随着……”,它既可表示一个具体的时间点，也可以表示一段时间。as可表示主句和从句的动作同时发生或同时持续，又可表示一个动作发生在另一个动作的持续过程中。如：AsIgotonthebus,

hegotoff.我上车，他下车。Asthedoctorswerecheckinghim,thepaingotworse.

医生给他做检查时，疼痛加剧了。Asitgrewdarker,itbecamecolder.

天色越晚，天气越冷。注意(1)如主句谓语动词表示的是短暂动作，从句时间状语指一段时间，when,while,as三者可通用。

Petercameinwhile/asIwaswatchingTV.

当Peter进来的时候我正在看电视。

IwaswatchingTVwhenPetercamein.

当Peter进来时我正在看电视。

Heenteredtheroomwhen/as/whilethemeetingwasgoingon.

正当开会的时候他走进了房间。(2)as和while可用来指一段时间，但as强调主句与从句表示的动作同时发生，while强调主句表示的动作是在while从句的动作延续中发生。

Asmymothersangthoseoldsongs,tearsrandownhercheeks.

当我妈妈唱起那些老歌时，眼泪顺着她的脸颊流了下来。

Icameinwhilehewasreadinganinterestingbookinhisroom.

我进来时他正在房间里读一本有趣的书。Practice1.I______________(watch)TVwhenshe_______(call).2.Whenthephone_______(ring),she___________(write)aletter.3.Whilewe____________(have)apicnic,it_________(start)torain.4.WhileJohn____________(sleep)lastnight,someone_______(steal)hiscar.waswatchingcalledrangwaswritingwerehavingstartedwassleepingstole5.Whilewe____________(wait)forthebus,agirl____________(run)uptous.6.I____________(telephone)afriendwhenBob__________(come)in.7.Jim____________(jump)onthebusasit____________(move)away.8.We____________(test)thenewmachinewhentheelectricity________(go)off.werewaitingwasrunningwasphoningcamewasjumpingwasmovingweretestingwent9.Whilemother___________(make)thebed,thedoorbell____________(ring).10.AsI____________(walk)inthepark,it_______(begin)torain.11.Itwasquitelateatnight.George__________(read)andAmy__________(play)herneedlewhenthey__________(hear)aknockatthedoor.wasmaking

rangwaswalkingbeganwasreadingwasplayingheard()1.Mary______adresswhenshecutherfinger.A.madeB.ismakingC.wasmakingD.makesPractice解析：割伤手指是已发生的事情，应用过去时。同时，when表时间的同时性，“玛丽在做衣服时”提供事情发生的背景，因此用过去进行时。C()2.Whileshe___thenewspaper,Granny___asleep.A.read;wasfallingB.wasreading;fellC.wasreading;wasfallingD.read;fell解析：while意为“当……之时”。描述一件事发生的背景时，用过去进行；当一个长动作发生的时候，另一个短动作发生了。句意：“在她看报纸时，奶奶睡着了”。Fallasleep意为“睡着了”。过去进行时的基本用法:表示过去某个时刻或时间正在进行过持续进行的动作,句中往往需要有时间状语来表示这一特定的时间。故选B。BWorkinpairstoaskandanswer.Lookatthepicturesandthenmakeconversations.Whatweretheydoing

whenitbegantorain?Theywereplayingcomputergameswhenitbegantorain.Theywereplayingchesswhenitbegantorain.WhileJakewassleeping,whatdidhisbrotherdo?WhileJakewassleeping,hisbrotherwasplayingbasketball.Whiletheyweredancing,thetelephonerang.Whenthetelephonerang,theyweredancing.Whiletheyweredancing,whathappened?Hewassingingwhenthebabystartedtocry.Whilehewassinging,thebabystartedtocry.Whilehewaswalking,ataxicame.Hewaswalkingwhenataxicame.

LastSaturdaywhileTonywasplayingfootball,Iwasswimmingwithmyfriendsinthepark.

LastSaturdaywhileTonywasdoinghomework,IwaswatchingTV.Completetheconversationwiththecorrectformofthewordsinthebox.D:Whendidthesnake(1)______you?H:Earlierthismorning.Itsuddenly(2)______infrontofmeandbitmyhand.D:Canyou(3)______meaphotoofit?H:Yes.Hereitis.D:Oh,thesnakewasonatable.H:Yes.I(4)______itonthetableafteritbitme.biteappearbiteshowthrowappearedshowthrewCompletethepassagewiththecorrectformoftheexpressionsinthebox.Whenthegirlwasridingherbike(1)___________withafriend,shehasanaccident.Theyweretalkingandtheywerenot(2)_______________.Acarcameroundthecornerbutstopped(3)___________.Thecardidnothither,butshe(4)_________herbike.sidebysidefalloffjustintimepayattentionsidebysidejustintimepayingattentionfelloffAroundtheworldAnemergencylandingUSAirwaysFlight1549PlanecrashintoHudsonRiverSearchandfindoutinformationaboutUSAirwaysFlight1549ontheInternet.

USAirwaysFlight1549wasUSAirways'scheduleddomesticcommercialpassengerflightfromLaGuardiaAirportinNewYorkCitytoCharlotte/DouglasInternationalAirport,Charlotte,NorthCarolina.OnJanuary15,2009,theAirbusA320-214flyingthisroutestruckaflockofCanadaGeese(加拿大黑雁)duringitsinitialclimbout,lostenginepower,andditched(紧急降落)intheHudsonRiveroffmidtownManhattan.Thebirdstrike,whichoccurredjustnortheastoftheGeorgeWashingtonBridgeaboutthreeminutesintotheflight,resultedinanimmediateandcompletelossofthrust(推力)frombothengines.Whenthecrewoftheaircraftdeterminedthattheywouldbeunabletoreliably(可靠地)reachanyairfield,theyturnedsouthboundandglidedovertheHudson,finallyditchedintheriveraboutthreeminutesafterlosingpower.Theincidentbecameknownasthe“Miracle(奇迹)ontheHudson”.WritinganewsreportaboutanaccidentThinkaboutarecentaccidentyouknow.Writenotes.Whenandwheredidithappen?Whydidithappen?Howdidithappen?Whathappenedaftertheaccident?ModuletaskUseyournotesandwritesentencesforyournewsreportabouttheaccident.Aterribleaccidenthappenedat…(Name)was…He/Shewasnot…(Theaccident)happenedbecause…Aftertheaccident…Bicyclesarepopularwithpeople.Mostpeoplethinkbicyclesaremuchsaferthananyothervehicle.Butsometimesbicycleaccidentsalsohappen.Theycanbringussadnessanddeathaswell.Atabout4:15yesterdayafternooninCaishikouStreet,ayoungmanwasridingveryfast,listeningtoanMP3.Metersawaytherewasasharpdowntotheleft,buttheyoungmandidn’tslowdown.Suddenlyacarcamefromtheopposi