状语从句时间原因

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1、Unit4GrammarEntertainmentGrammar---Adverbialclausesoftime/reason(一)Adverbialclauseoftime:when、while,、as、after、before、since、until/till、every/eachtime、whenever…1、before=atanearliertimethan2、after=atalatertimethan3、whileandas=atthesametimeaswhileisusuallyusedwithlongeractionsandaswithshorteract

2、ions4、Since=fromthetimethat5、until=uptothetimethatwhenspeaking,wecanusetillinsteadofuntilwhen①当…时侯②就在这时Shewasdoingherhomeworkwhenshehadagoodidea.when、while、as的区别while①当…时侯（从句的谓语必须是持续性动词，与主句谓语同时进行且用进行时态；或从句用“be+表语”表示状态）②趁…之时；③然而(并列句)；④尽管as①当…时，在…的同时；②一边…一边…；③随着...Astimewentby,herealizedhismis

3、take.1)_________hecomesheretomorrow,Iwillcallyou.(atthetimethat)2)Henryisinchargeoftheoffice_______Mr.Smithisaway.(duringthetimethat)HelearnedtospeakEnglish______hewashere.4)Iliketea_________shelikescoffee.5)_______theywerepickingtea,thegirlsweresinginghappily.6)Shesang_______sheworked.Whenw

4、hilewhilewhileAsasExercisesbefore：1、IhadenteredtheclassroombeforeIheardthebell.2、You’dbetterwriteitdownbeforeyouforgetit.3、Lookbeforeyouleap.（三思而后行）4、ItwillbehalfayearbeforeIcomehereagain.5、Itwaslessthanonemonthbeforetheygottheresult.注意英汉的差别1、“在…之前；才…；2、还没来得及…就；3、没过多长时间就；4、趁还没…；5、一…就…”等。it+b

5、e+time+before句型归纳1.Itwasnotlongbeforeshelearnedthosepoemsbyheart.2.Itwaslongbeforethepolicearrived.3.Itwillbehoursbeforehemakesadecision.4.Itwillnotbehoursbeforewemeetagain.用不了多久又一条新的遂道就要建成穿过浦江。Itwon’tbelongbeforeanewtunnelisbuiltacrosstheHuangPuRiver.过了好多年他才知道谁在他困难时帮助了他。Itwasmanyyearsbe

6、foreheknewwhohadhelpedhimwhenhewasintrouble.Since的用法eg:Itisfiveyearssinceshecamebacktosettledownfromabroad.eg:ItisthreeyearssinceIbegantosmoke.eg:ItisthreeyearssinceIsmokedacigarette.eg:Itisfouryearssincehelivedhere.注意：这个句型的时间要从since从句中作谓语的动作或状态结束后算起；如果since从句的谓语是持续性或反复性动词时，要按否定来理解。Itis/hasb

7、een+时间段+since…“自从…以来已有多长时间了”themoment,theminute,thesecond,theinstant,（结合报纸）1、Theenginestartedtheminutethebuttonwaspressed.2、Thelampwilllightthemomentyoupressthebutton.3、IknewIhadmadeamistaketheinstantIhaddoneit.一…就…assoonasassoonasnosooner…than,har