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1、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.Ithoughthernice
2、andhonestthefirsttimeImether.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.
3、（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：Iwashavingarestonthesofawhenthetel
4、ephonerang．Theyweresurprisedthatachildshouldworkouttheproblemwhiletheycouldn’t.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…
5、(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的词义：1.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)和not…till(until
6、)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：Notuntilhereturnshomewil
7、lshegotobed.(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
8、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…,hard
