时间状语从句常见的从属连词有：（注意其汉语意义）when,while,as,before,after,since,until（till）onceassoonas,themoment,theminute,immediately,directly,each/everytime,thefirsttime,thelasttime,nexttime,bythetime,whenever等。例如：Every/EachtimeIwasintrouble,hewouldcometomyhelp.IthoughtherniceandhonestthefirsttimeImether.注意：（1）when,while,as的区别：1）when引导从句时，主从句的动作有先有后，也可以同时进行,从句的动作可以是持续性的，也可以是短暂的。如：WhenIgottotheairport,theplanehadalreadytakenoff.（主先从后）（短暂性）WhenIlivedthere,IusedtogototheseasideonSundays.（同时）（持续性）Whenthemovieended,thepeoplewentback.（从先主后）2)while侧重主从句动作的对比，且从句的动词必须是持续性的。如：Whilewewerechattingshewaslookingatthetimetableonthewall.3)as引导从句时侧重主从句动作同时或几乎同时进行，从句的动作可以是持续性的，也可以是短暂的。如：SometimesIwatchTVasIamhavingbreakfast.4)when和while还可以是并列连词，意思分别是“就在这时”，“然而”。如：Iwashavingarestonthesofawhenthetelephonerang.Theyweresurprisedthatachildshouldworkouttheproblemwhiletheycouldn't.词义：注：并列连词when常用与以下句型中：①...was/weredoing...when...（正在做…突然）②...was/wereabouttodo...when...（刚要做…突然）③...was/wereonthepointofdoing...when...（刚要做...突然）④...hadjustdone...when....（刚一…就）⑤Hardly/Scarcelyhad...done...when...（刚一…就）(2)before引导从句时,词义非常灵活，注意下列句子中的before的l.BeforeIcouldgetinaword,thetailorhadmeasuredme.（还没来得及…就)2.Wehadn'trunamilebeforehefelttired.(还没…就)3.Wehadsailed4daysbeforewesawland.(…才...)4.Pleasewriteitdownbeforeyouforgetit.(趁还...没就)(3)till(until)禾口not・・・till(until)1)till(until):主句谓语动词必须是持续性的，意思是“到…为止“如:Heremainedtheretill/untilshearrived.2)not.till(until).:主句谓语动词必须是短暂性的，意思是“直到…才”如：Shewon'tgotobedtill/untilhereturnshome.3)not.until还有强调式和倒装式:强调句：Itisnotuntilhereturnshomethatshewillgotobed.倒装句：Notuntilhereturnshomewillshegotobed.(4)几个极易混淆的时间状语从句：1)Itwas+时间点+when...(当的时候时间是)Itwas5amwhenwearrivedatthevillage.2）Itwas/willbe+时间段+befOre...（没过…就/过了…才）Itwas/willbetwoweeksbeforewemet/meetagain.3）Itis/hasbeen+时间段+since...（自从...以来有…）Itis/hasbeen3yearssincewelastmet.突破点：一看be动词的时态，二看时间段还是时间点。注意：在“Itis/hasbeen+时间段+since...”句型中，从句的动词必须是短暂性的，如果是延续性的动词，时间要从从句的动作结束时算起。如：Itis3yearssinceIsmoked.（我戒烟有三年了）补充：assoonas,immediately,directly,instantly,themoment,theminute,theinstant,nosooner...than...,hardly/scarcely....when....和once这些从属连接词引导的从句都表示从句的动作一发生，主句的动作随即就发生，常译为“一…就…”。从句中一般时态代替将来时态。everytime,eachtime,nexttime,thefirsttime,anytime,allthetime等名词短语用来引导时间状语从句，表示“每当...，每次...；下次..”等。练习题1.Itwasquietthosebigtrucksstartedcomingthroughthetown.A.beforeB.afterC.untilD.unless2.Itseemedonlysecondstheboyfinishedwashinghisface.A.whenB.beforeC.afterD.evenif3.Hardlyhadhereachedtheschoolgatethebellrang.A.whileB.whenC.asD.assoonas4._________________________________________________Weweretoldthatweshouldfollowthemainroadwereachedthecentralrailwaystation.A.wheneverB.untilC.whileD.wherever5.IrecognizedyouIsawyouattheairport.A.themomentB.whileC.afterD.once6.Hewasabouttogot...
