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时间状语从句时间状语从句定义：由一个完整的句子充当时间状语。用法：常用when，as，while，before，after，since，till，until，assoonas,immediately,themoment,theminute等连词引导。1.when,while,as（1）when:“当……时候”从句中的动词为延续性动词/非延续性动词；when:并列连词，“这时，突然”（2）while：“与…同时，在…期间”从句中的动词为延续性动词/表状态的词；从句中动作与主句中动作同时发生；句子的谓语多用进行时态。（3）as:从句中的动作与主句中的动作同时发生，“当…时候，一边…一边”从句中动词多为延续性动词/非延续性动词；2.before:在……之前after:在……之后3.since：“自从……以来”,主句通常用现在完成时。4.till,until：表示“直到……时”till：主句和从句都用肯定形式。Theyoungreadtill/untilthelightwentout.not…until:“直到……才”Hedidn'tgetupuntilhismothercamein.5.assoonas,immedirately,themoment,theminute一……就……I’llringyouupassoonasIgetananswerfromhim.Jackwenttoschoolassoonashegotwell.6.once一旦……就……•一旦见到他,你就再也忘不掉他了。•Onceyouseehim,youwillneverforgethim.ThePastPerfectTense过去完成时1.构成:had+done(过去分词)•----------|----------------|--------------------|---→过去的过去过去现在2.过去完成时的用法:表示在过去某个时间或动作之前已经发生或完成的动作“过去的过去”1.by+过去时间点,如：bythetime,bythen,bylastyear,bytheendoflastyear/month…,byfiveo’clockyesterdayevening…Bytheendoflastterm,they____________(learn)10Englishwords.hadlearned2.before+过去时间点We____________(arrive)thestationbeforeteno’clock.hadarrived3.uptill/until+过去时间点如：uptillthen,upuntillastnight…LiLei___________(wash)thedishesuptillthen.hadwashed4.常用于宾语从句中Shesaidthatshe____________(write)threee-mails.hadwritten5.与when,before,after,assoonas,until/till等引导的状语从句连用或用于从句中Theairplane_______already_______(leave)whenIgottotheairport.6.根据上下文判断IwenttoLiHong’shouse,buthe____________(go)out.hadhadgoneLastnight,assoonasI_________(finish)mywork,Iwenttosleep.hadfinishedleft7.表示意向的动词，如hope,wish,expect,think,intend,mean,suppose等的过去完成时表示“原本……”（实际上未能……)Wehadhopedthatyouwouldcome,butyoudidn’t.我们本希望你能来的，但是你没有。8.hardly...when...,nosooner...than...1)nosooner...than...，一...就...，主句过去完成时,than后面从句用一般过去时.(nosooner后面是主句;than后面是从句)例:Ihadnosoonerreachedhomethanitbegantorain.Nosooner...than...常放在句首,表示强调.这时主句要倒装.例:NosoonerhadIreachedhomethanitbegantorain.2）hardly/scarely...when意思为:还没...就.../刚…就…(主句过去完成时,when引导从句一般过去时)•例:Wehadhardlygottentherewhenitbegantorain.•我们还没到那儿,天就下起雨了.•Hardly...when...也常放在句首•例:Hardlyhadwegottentherewhenitbegantorain.