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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、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,last
2、time…等引导。*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.(从句动作在前)as引导持续性动作,侧重主句和从句的动作同时发生。Hehurriedhome,lookingbehindashewent.Isawyoursisterasshewasgettingont
3、hebusyesterday.HesangashewalkedWhile: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
4、可表示“如果”。如:Don’tbeafraidofaskingforhelp_____itisneeded.A.UnlessB.sinceC.althoughD.when当When和while为并列连词,while表示对照的意思。When表示“这时,突然…”1)Idoeverysinglebitofhousework____myhusbandBobjustdoesthedishesnowandthen.A.sinceB.whileC.whenD.as2)Hewasabouttotellmethesecret____someonepattedhimonthe
5、shoulder.A.asB.untilC.whileD.when*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.例:Weweretoldthatweshouldfollowthemainroad_until_wereachedthecentralrailwaystation.②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.③放在句首表示强调时一般用until。
6、如:(倒装)Untilhereturns,nothingcanbedone.Notuntilallthefishdiedintheriver___howseriousthepollutionwas.(NMET95)A.didthevillagersrealizeB.thevillagersrealizedC.thevillagersdidrealizeD.didn’tthevillagersrealize其他引导词例句:Bythetimehewasfourteen,hehadtaughthimselfadvancedmathematics.Eachtime
7、hecame,hewouldcallonme.Youmustshowhiminimmediatelyhecomes.IrecognizedhimthemomentIsawhim.*assoonas,hardly…when…nosooner…than…区别这三个短语都有“一……就”、“刚刚……就”的意思,它们的意思非常相近,因此有时可以互换。例如:“我刚到公共汽车站,汽车就开了。”一句,就可以有如下几句译法:AssoonasIgottothebusstop,thebusstarted.HardlyhadIgottothebusstopwhenthebusst
8、arted.NosoonerhadIgottothebusstop