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1、时间和原因状语从句when,while,as表“当...时”的异同：相同点:当从句的谓语是延续性动词时，三者常可互换i.e.When/While/Aswewerestilllaughing,theteachercamein.不同点:1)when既表“时间段”又表“时间点”(=duringoratthetimethat),从句中动词既可是终止性的，也可是持续性的，还可表“正在这时”i.e.(1).WhenIarrivedthere,theywerewatchingTV.(2).WhenIwasyoung,Ilikedsinginganddancing
2、.2)while只表“时间段”(=duringthetimethat),从句中动词只限于持续性动词，它有时含对照之意，表“然”而i.e.(1)Hefellasleepwhilehewasstudyinghisgrammarbook.3)as用法与when相似，但它侧重动作的同时性，表“一边...一边...”，还表“随着”i.e.(1)Theytalkedastheywalked.(2)Astimegoesby,wegetwiser.1.when---正在…的时候，突然…IwaswalkingalongthestreetwhenImethim.O
3、neevening,littleHanswassittingnearthefirewhenheheardaloudknockatthedoor.Iwasabouttofallasleepwhenmysistercamein.Hehadjustgotbackhomewhenthetelephonerang.我正准备告诉他那个秘密，这时有人拍了拍我的肩膀。Iwasabouttotellhimthesecretwhensomeonepattedmeontheshoulder.Ihadhardlygothomewhenitbegantorain.Hardl
4、yhadIgothomewhenitbegantorain.1.Hetransplantedthelittletreetothegarden______itwasthebesttimeforit.A.whereB.whenC.thatD.until2.---DidJackcomebackearlylastnight?---Yes.Itwasnotyeteighto’clock____hearrivedhome.A.beforeB.whenC.thatD.until3.Hewasabouthalfwaythroughhismeal______afam
5、iliarvoicecametohisears.A.whyB.whereC.whenD.while1)ThecostoflivinginGlasgowisamongthelowestinBritain,______thequalityoflifeisprobablyoneofthehighest.A.sinceB.whenC.asD.while2)______Iacceptthatheisnotperfect,Idoactuallyliketheperson.A.WhileB.SinceC.BeforeD.Unless2.连接词while的用法小结
6、1)while引导的动作必须是持续性的，侧重主句动作和从句动作相对比。如：Pleasedon’ttalksoloudwhileothersareworking.2)while作为并列连词，意为“而，却”，表示对比。3)while可表示尽管，相当于although。WhileIwaswaitingforTom,threebuseswentby.Idoeverysinglebitofhousework,whilemyhusbandBobjustdoesthedishesnowandthen.Whilemodelingbusinessisbynomean
7、seasytogetinto,thegoodmodelwillalwaysbeindemand.when/whiledoing:1)When/WhileIwaslookingthroughthepaper,InoticedafewgrammaticalmistakesWhen/Whilelookingthroughthepaper,Inoticedafewgrammaticalmistakes.2)Whilehewaswanderingthroughthesquare,hecaughtsightofasnake-charmerWhilewander
8、ingthroughthesquare,hecaughtsightofasnake-charmerwhen/whiledo
