时间状语从句ppt

1.when的用法when“当……时候”,从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。Whenshecameintomyroom,Iwasjustreadingabook.她走进我房间时，我正在看书。WhenIgottotheairport,theguestshadleft.当我赶到飞机场时，客人们已经离开了。“当……时候”Shewasabouttogooutforawalkwhenherunclecame.她正打算出去散步，就在那时她叔叔来了。Shewascookingwhensomeoneknockedatthedoor.她正在做饭，就在这时有人敲门。就在那时atthattime当while事件正在发生的时候，另一件事如何,while从句一般用的是正在进行时Whilemywifewasreadingthenewspaper,IwaswatchingTV.当妻子正在看报纸的时候，我正在看电视。WhileJimwasmendinghisbike,LinTaocametoseehim.正当吉姆修自行车时，林涛来看他。2.while的用法WhileJimwasmendinghisbike,LinTaocametoseehim.正当吉姆修自行车时，林涛来看他。Whiletheyweretalking,thebellrang.正在他们谈话的时候，上课铃响了。含有“一段时间”的含义as从句用的一般不用正在进行时，而只是一般过去时,一边……一边……”Asmymothersangthoseoldsongs,tearsrandownhercheeks.当我妈妈唱起那些老歌时，眼泪顺着她的脸颊流了下来。Thelittlegirlssangastheywent.小姑娘们一边走，一边唱。3.as的用法Asthetimewenton，theweathergotworse.随着时间的推移，气候更加糟糕。Asyearsgoby，Chinaisgettingstrongerandricher.随着时间一年一年过去，中国变得越来越富强了。as常常翻译成“随着……”之意。如果从句动作和主句动作同时发生，并且从句动作为延续性动词时，when，while，as可以互换使用。这种情况下，它们的细微区别恐怕连英、美人自己也说不清了。1.When/While/Asweweredancing,astrangercamein.当我们跳舞时，一位陌生人走了进来。[dance为延续性动词]2.When/While/Asshewasmakingaphonecall,Iwaswritingaletter.当她在打电话时，我正在写信。[make为延续性动词]3.While/When/AsIwaswalkingdownthestreet,Inoticedapolicecarinfrontofthebank.我顺着马路往前走时，发现银行门前停着一辆警车。when,while,as的互换肯定形式表示的意思是“做某事直至某时”，动词必须是延续性的。否定形式表达的意思是“直至某时才做某事”。动词为延续性或非延续性都可以。4.until和till直到…为止肯定句：Isleptuntilmidnight.我一直睡到半夜时醒了。WaittillIcallyou.等着我叫你。否定句：Shedidn'tarriveuntil6o'clock.她直到6点才到。Don'tgetoffthebusuntilithasstopped.公共汽车停稳后再下车。Hismotherdidn’tleaveuntil/tillhewasasleep.直到他睡着了，他母亲才离开。until和tillNotuntil…在句首，主句用倒装。Notuntiltheearlyyearsofthe19thcenturydidmanknowwhatheatis.Itisnotuntil…that….ItwasnotuntilIbegantoworkthatIrealizedhowmuchtimeIhadwasted.Shesaidshewouldphonemeassoonasshegotthere.她说她一到达那里就给我电话I’lltelephoneyouassoonasIgetthere.我一到达那里就打电话给.5.assoonas一…就…“一……就……”的结构hardly/scarcely…when/before,nosooner…than和assoonas,themoment/minute…,都可以表示“一……就……”的意思.Ihadhardly/scarcelygothomewhenitbegantorain.刚回家，就下起雨来了。Ihadnosoonergothomethanitbegantorain.AssoonasIgothome,itbegantorain.注意：如果hardly,scarcely或nosooner置于句首，句子必须用倒装结构。Hardly/ScarcelyhadIgothomewhenitbegantorain.NosoonerhadIgothomethanitbegantorain.before的本意为“在……之前”，根据具体语境还可理解为“还没来得及/还没有……就……，趁着还没…。…就……，不知不觉就……，……才……”等Closethedoorbeforeyouleavetheroom.离开房间前关上门。Ihadnotsatlongbeforehecameback.我没坐多久他就回来了Healmostknockedmedownbeforehesawme.他几乎把我撞倒才看到我。6.before从句ShehasnevercometoseemesinceIlivedinthecity.自从我住到城里，她就一直不来看我。IhavelivedhereeversinceIwasachild.我从还是个孩子时就一直住在这儿7.since从句IwenttoschoolafterIfinishedmybreakfast.吃完早饭后我就去上学了。after“在……之后”1.Ihaven'theardfromhim_____hewenttoAmerica2.Donotleavetheroom_____youhavefinishedthetest..3.Shesang______shewentalong.练习1.Itwasquiet________thosebigtrucksstartedcomingthroughthetown.A.beforeB.afterC.untilD.unless2..Hardlyhadhereachedtheschoolgate________thebellrang.A.whileB.whenC.asD.assoonas3.Hewasabouttogotobed________thedoorbellrang.A.whileB.asC.beforeD.when4._____JohnwaswatchingTV,hiswifewascooking.A.AsB.AssoonasC.WhileD.Till练习