as-when和while的区别

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When,as和while的区别①when/as是atorduringthetimethat,既指时间点,也可指一段时间;•while是duringthetimethat,只指一段时间。•when/as引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。Sorry,Iwasoutwhen(as)youcalledme.Hecanwriteonlywhen(as/while)thebabyisasleep②when说明从句的动作和主句的动作可以是同时,也可以是先后发生;as,while则是同时发生。When/While/Asshewasmakingaphonecall,Iwaswritingaletter.Striketheironwhileitishot.Tomwasdisappointedthatmostoftheguestshadleftwhenhearrivedintheparty.③when和while还可作连词。when表示“在那时(突然)”常用句型bedoingwhenbeabouttodowhenIwaseatingwithmywifeandchildrenwhenweheardaloudnoiseWhile可表示“而,却”,表对比。Helikesherwhileshelikeshim.④as常表示“随着……”;“一边……,一边……”Asautumnapproaches,itisgettingcolder.Thelittlegirlssangastheywent.5.as还可以表示原因(because,for)Ididn’tvisitUasIknowyouwerenotathome6.还可以用于倒装结构中,表示尽管…形、副词+as+主+谓,主句名词(前不加冠词)+as+主+谓,主句Youngasheis,heknowsalot.Childasheis,heknowsalot.1.(2007山东)_______Ireallydon’tlikeart,Ifindhisworkimpressive.A.AsB.SinceC.IfD.While2.(2007四川)I’dliketostudylawatuniversity________mycousinprefersgeography.A.thoughB.asC.whileD.For3.(2007重庆)______,hisideawasacceptedbyallthepeopleatthemeeting.A.StrangeasmightitsoundB.AsitmightsoundstrangeC.AsstrangeitmightsoundD.StrangeasitmightsoundDCD4.(2006广东)JennywasverysadoverthelossofthephotosshehadshotatCanada,________thiswasamemorysheespeciallytreasured.A.asB.ifC.whenD.Where5.(2006湖南)Ihadjuststeppedoutofthebathroomandwasbusilydryingmyselfwithatowel________Iheardthesteps.A.whileB.whenC.sinceD.after6.(哪个不对)---I’mgoingtothepostoffice.---_____you’rethere,canyougetmesomestamps?A.AsB.whenC.whileD.IfABD

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