会计学1.时间状语从句2)while,when,as辨析Whenhereturned,hiswifewascooking.Whilehewasreading,hiswifewascooking.Hehurriedhome,lookingbehindashewent.对比训练1____heheardthis,hegotveryangry.2.ImetLucy____Iwaswalkingalongtheriver.3.____achild,helivedinthecountryside.A.whenB.whileC.as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：①WhileIwaswalkingdownthestreet,Icameacrossanoldfriend.(while=_______)②Helikespopmusic,whileIamfondoffolkmusic.(while③WhileIreallydon’tlikeart,Ifindhisworkimpressive.(while=___________)Wewereabouttoleave____itbegantorain.2.ShethoughtIwastalkingaboutherson,____,infact,Iwastalkingaboutmyson.3.HardlyhadIfinishedmycomposition____thebellrang.A.whenB.whileC.asD.during3)until/till(不用于句首)4)表示“一…就…”的句型(1)assoonas,once,themoment/minute/second,immediately/directly/instantlyAssoonashecomes,I’lltellhim.ThemomentIsawhim,Irecognizedhim.Ileftimmediatelytheclockstruck5.(2)on/upondoing/on(upon)one’s+nOnarrivingatthestation,thethiefwasarrested.OnhisarrivalinParis,hewasrecognizedasafamousperson.5)Everytime,eachtime等也可以引导时间状语从句连接词before的小结：1.Wehadsailedfourdaysandfournightsbeforewesawland.2.Wehadn’trunamilebeforehefelttired.4.BeforeIcouldgetinaword,hehadmeasuredme.1）句型Itwillbe/was＋段时间＋before…“还要过多久才……”如：Itwillbetwoyearsbeforeheleavesthecountry.2）句型Itwillbe/wasnot＋一段时间＋before…“不多久就……”如：Itwasn’ttwoyearsbeforeheleftthecountry.一、若since引导的状语从句的谓语动词是终止性的过去时，则从句表示的时间是“从动作开始的那一时刻起”。如：Hehasstudiedveryhardsincehecametoourschool.自从他来到我们学校，他学习就非常努力。Wehavebeenmissingthemsincetheylefthere自从他们离开这里，我们就一直很想念他们。二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时，则从句表示的时间是“从那持续动作或状态结束时算起”。如：Ihaven’theardanynoisesinceIslept.Sleep为持续性动词，sleep的动作结束时，即“醒来”时，这句应译为“我醒后还未听到任何声音”。JohnisnowwithhisparentsinNewYork,itisalreadythreeyearssincehewasateacher约翰现在和父母一起住在纽约，他不当