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1、状语从句状语从句时间状语从句地点状语从句原因状语从句目的状语从句结果状语从句条件状语从句方式状语从句让步状语从句比较状语从句1.时间状语从句1)由连词when,while,as,assoonas,before,after,since,till/until等引导。主句用将来时，从句常用一般现在时表将来Iwilltellhimwhenhecomesback.2)while,when,as辨析While引导的时间状语从句只指一段时间，强调某一段时间内，主从句动作同时发生。从句动词常是延续性的When既可以指一个时间点,也可以是一段时间，可表示主从句的动作同时或先后发
2、生。从句动词可以是延续性的，也可以是非延续性的。As强调主句﹑从句动作相并发生,译为”一边…一边…”Whenhereturned,hiswifewascooking.Whilehewasreading,hiswifewascooking.Hehurriedhome,lookingbehindashewent.对比训练1____heheardthis,hegotveryangry.2.ImetLucy____Iwaswalkingalongtheriver.3.____achild,helivedinthecountryside.A.whenB.whileC.a
3、s另外,when/while还作并列连词,连接并列分句,while表示“而,可是”如:IlikereadingwhilemywifeenjoyswatchingTV.when表示“就在这时”在下列结构中，表示某件事正在发生或刚刚发生，另一动作同时发生。1.beabouttodo…when…2.bedoing…when…3.haddone…when…e.g.Wewereabouttostartwhenitbegantorain.Iwasplayingcomputergameswhenmomcamein.while的用法小结：①WhileIwaswalkingdo
4、wnthestreet,Icameacrossanoldfriend.(while=_______)②Helikespopmusic,whileIamfondoffolkmusic.(while③WhileIreallydon’tlikeart,Ifindhisworkimpressive.(while=___________)whenalthoughbutWewereabouttoleave____itbegantorain.2.ShethoughtIwastalkingaboutherson,____,infact,Iwastalkingaboutmyso
5、n.3.HardlyhadIfinishedmycomposition____thebellrang.A.whenB.whileC.asD.during3)until/till(不用于句首)“延续的动词（肯定式）+until”表示“直到…为止”Iwaitedforhimuntilhecameback.“非延续性动词（否定式）+until”表示“直到┅才”Hedidn’tgotobeduntilhefinishedhiswork.Notuntilhesawithimselfdidhebelieveit.注意:notuntil在句首时要倒装4)表示“一…就…”的句
6、型(1)assoonas,once,themoment/minute/second,immediately/directly/instantlyAssoonashecomes,I’lltellhim.ThemomentIsawhim,Irecognizedhim.Ileftimmediatelytheclockstruck5.(2)on/upondoing/on(upon)one’s+nOnarrivingatthestation,thethiefwasarrested.OnhisarrivalinParis,hewasrecognizedasafamousp
7、erson.5)Everytime,eachtime等也可以引导时间状语从句EverytimeIcaughtacold,Ihadpaininmyhead.(3)nosooner…than/hardly…when/scarcely…whenNosoonerhadtheyreachedhomethanitstartedtorain.HardlyhadIenteredtheroomwhenthetelephonerang.连接词before的小结：1.Wehadsailedfourdaysandfournightsbeforewesawland.2.Wehadn’t
8、runamilebeforehefel
