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when,while和as的用法一．when，while，as在时间状语从句中的区别：①三者均可表示“当……的时候”，如果主句表示的是短暂的动作，而从句表示的是一段时间，三者可通用。如：ImetKangLias／when／whileIwaswalkingalongthestreet．当我沿街散步时碰见了康丽。②when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。如：Itwassnowingwhenwegottotheairport．当我们到达机场时，天正下着雪。（不能用while）③as强调主句与从句表示的动作同时发生，as常表示“随着……”；“一边……，一边……；while强调主句表示的动作持续于while所指的整个时间内；when可指主、从句所述动作同时或先后发生。如：Asthetimewenton，theweathergotworse．（as表示“随着……”之意）Hesangashewentalong．他边走边唱。PleasewritewhileIread．我读的时候，请写下来。Whenhereachedhome，hehadalittlerest．回到家后，他休息了一会儿。④when用于表示“一……就……”的句型中（指过去的事情）。somebodyhadhardly（＝scarcely）done…when．．．＝Hardly／Scarcelyhadsomebodydone…when．．．①Ihadhardly／scarcelyclosedmyeyeswhensomeoneknockedatthedoor．＝Hardly／ScarcelyhadIclosedmyeyeswhensomeoneknockedatthedoor．我刚一闭上眼，就有人在敲门了。二.when,while和as都可引导让步状语从句：①．when引导让步状语从句，意为“尽管，虽然”相当于though或although:Theystoppedtryingwhentheymighthavesucceedednexttime.②while引导让步状语从句，相当于although，是较为正式的书面语:WhileIamwillingtogo,Iwouldlikeitbetterthatyouwent.③as引导让步状语从句必须倒装，从句中的表语，状语或动词原形置于句首，若表语为名词，前置时省略冠词。Childasheis,heknowsalot.MuchasIlikeit,Iwillnotbuyit,forit’stooexpensive.Tryashemight,hecouldn’tfindajob.三.when和while可用作并列连词:①when作并列连词，意为“突然，正在那个时候”常运用于以下句型中：Somebodybeabouttodo…when…Somebodybeonthepointofdoing…when…Somebodybedoing…when…Somebodyhaddone…when…Wewerehavingameetingwhensomeonebrokein.Wewereabouttosetoffonourway,whenitsuddenlybegantorain.②作并列连词，意为“而，却”，表示对比。Helikespopmusic,whileIamfondofmusic.四.when和as用于原因状语从句中:①when=since,nowthat…“既然”Whydoyouwantanewjobwhenyou’vegotsuchagoodonealready?②意为“因为”，指说话双方都知道的原因。Ashewasnotreadyintime,wewentwithouthim.组题练习：1.Successcame______shebegantoplayleadingpartsinradioplays.A.WhileB.asC.whenD.if2.Theatmospheregetsthinnerandthinner_______theheightincreases.A.WhenB.asC.whileD.since3.Iwasjustabouttogotosleep______therewasaloudknockonthedoor.A.WhileB.whenC.asD.since4.Theyweresurprisedthatachildshouldworkouttheproblem_____theythemselvescouldn’t.A.WhenB.whereC.untilD.while5.Wewereswimminginthelake______suddenlythestormstarted.A.WhenB.whileC.untilD.before6.Idoeverysinglebitofhousework______myhusbandBobjustdoesthedishesnowandthen.(04高考广西卷)A.SinceB.whileC.whenD.as7._____Iacceptthatheisnotperfect,Idoactuallyliketheperson.(04高考江苏卷)A.WhileB.SinceC.BeforeD.Unless8.Jasminewasholidayingwithherfamilyinawildlifepark_____shewasbittenonthelegbyalion.(04高考上海卷)A.WhenB.whileC.sinceD.once9._____modelingbusinessisbynomeanseasytogetinto,thegoodmodelwillalwaysbeindemand.(o4高考浙江卷)A.WhileB.SinceC.AsD.If10.Allgasesandmostliquidsandsolidsexpand______heated.A.asB.whileC.beforeD.when11.Wehaveonlythreebooks______weneedfive.A.asifB.ifC.whenD.eventhough12.Howcanweexplainittoyou_____?A.whileyouarelisteningB.unlessyouwilllistenC.asyouwon’tlistenD.whenyouwon’tlisten13._______Ihadtoworktosupportmyfamily.A.WhenIwasalittlechildB.WhileIwasalittlechildC.AsIwasalittlechildD.BeforeIwasalittlechild14._____________,helicoptersflewtotheburningbuilding.A.WhilethefirefightersweretryingtocontrolthefireB.AsthefirefightersweretryingtocontrolthefireC.AssoonasthefirefightersweretryingtocontrolthefireD.Afterthefirefightershadcontrolledthefire15.Thehusbandwaslookingafterthebaby__________.A.afterhiswifecookedinthekitchenB.ashiswifewascookinginthekitchenC.whenhiswifewascookinginthekitchenD.whilehiswifewascookinginthekitchen16.Lookatthesun.Itisshining._______it’ssunny,let’sgoforawalk.A.asB.whenC.ifD.assoonas17.Thesadmothersatontheroadside，shouting_______shewascrying.A.whatB.whenC.asD.which18.Hardlyhadweenteredtheroom______itbegantorain.A.whileB.asC.thenD.when19.___________,hedoesgetannoyedwithhersometimes.(04).A.AlthoughmuchhelikesherB.MuchalthoughhelikesherC.AshelikeshermuchD.Muchashelikesher20.______yearsgoby，Chinaisgettingstrongerandricher.A.WhenB.AsC.WhileD.SinceKeys:1-10CBBDA/BAAAD11-20CDAAD/ACDDB