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1、状语从句状语从句在主从复合句中修饰主句中的动词,形容词或副词,按意义可分为时间、地点、原因、目的、结果、条件、方式、比较、让步等状语从句。从句的位置放在句首,也可放在句末。放在句首时,从句后面常用一个逗号,放在句末时,从句前一般不用逗号。(1)when,as,while(从属连词)when即可引导持续性动作,又可引导短暂性动作。它可以表示主句的动作和从句的动作同时发生,或从句的动作发生在主句动作之前。如:WhenIwasaboy,IusedtogototheseashoreonSundays.(同时)Whenthelessonwasover,webeganourwriting.(从句动作
2、在前)1、时间状语从句:引导时间状语从句的从属连词有:when,while,as,whenever,before,after,since,till,until,assoonas,once,themoment,immediately,nosooner…than,hardly…when,bythetime,everytime,lasttime…等引导。as引导持续性动作,侧重主句和从句的动作同时发生。Hehurriedhome,lookingbehindashewent.Isawyoursisterasshewasgettingonthebusyesterday.Hesangashewalk
3、ed.While:指的是“在某一时间里”,“在…期间”,从句里的动作必须是持续性的,它也强调主句和从句动作的同时发生,往往侧重主句和从句动作的对比。如:WhilehewasinLondon,hestudiedmusic.WhilewewerewatchingTV,hewaswritingacomposition.当when,as,while表示“在…一段时间里”,主从句的动作同时发生时,可以换用。如:While(When或As)wewerediscussing,Mr.Smithcamein.*when可表示“如果”。如:Don’tbeafraidofaskingforhelp_____i
4、tisneeded.(’03全国)A.UnlessB.sinceC.althoughD.when*while可表示“虽然,尽管”。如:1)____modelingbusinessisbynomeanseasytogetinto,thegoodmodelwillalwaysbeindemand.(’04浙江)A.WhileB.SinceC.AsD.If2)_____Iacceptthatheisnotperfect,Idoactuallyliketheperson.(’04江苏)A.WhileB.SinceC.BeforeD.UnlessWhen和while(并列连词),while表示对照
5、的意思。When表示“这时,突然…”Idoeverysinglebitofhousework____myhusbandBobjustdoesthedishesnowandthen.(’04广西)A.sinceB.whileC.whenD.as2)Hewasabouttotellmethesecret____someonepattedhimontheshoulder.(’02上海)A.asB.untilC.whileD.when3)Wewereswimminginthelake____suddenlythestormstarted.(’04北京春招)A.WhenB.whileC.until
6、D.before4)Jasminewasholidayingwithherfamilyinawildlifepark____shewasbittenonthelegbyalion.(’04上海)A.WhenB.whileC.sinceD.before(2)till和until①如果主句谓语动词是持续动词,通常用肯定式的主句,表示“直到…为止”。如:Iworkedtill(until)hecameback.1)Agoodstorytellermustbeabletoholdhislisteners’curiosity_____hereachestheendofthestory.(’03上海
7、)A.whenB.unlessC.afterD.until2)Weweretoldthatweshouldfollowthemainroad___wereachedthecentralrailwaystation.(’04辽宁)A.wheneverB.untilC.whileD.wherever②如果主句谓语动词是瞬间动词,则用否定式的主句表示“直到…才”。如:Ididn’tgotobeduntil(till)hecameback.