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AdverbialClausesofTime时间状语从句: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)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.Oneevening,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.1.Hetransplantedthelittletreetothegarden______itwasthebesttimeforit.A.whereB.whenC.thatD.until2.---DidJackcomebackearlylastnight?---Yes.Itwasnotyeteighto’clock____hearrivedhome.A.beforeB.whenC.thatD.until3.Hewasabouthalfwaythroughhismeal______afamiliarvoicecametohisears.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.Whilemodelingbusinessisbynomeanseasytogetinto,thegoodmodelwillalwaysbeindemand.when/whiledoing:1)When/WhileIwaslookingthroughthepaper,InoticedafewgrammaticalmistakesWhen/Whilelookingthroughthepaper,Inoticedafewgrammaticalmistakes.2)Whilehewaswanderingthroughthesquare,hecaughtsightofasnake-charmerWhilewanderingthroughthesquare,hecaughtsightofasnake-cha