as-when和while的区别

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