易混句型辨析.doc

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1、易混淆句型1.Itis/hasbeen+一段时间＋since从句(did)延续性动词:反过来翻译短暂性动词:直译Itis10yearssinceIsmoked.(=Igaveupsmoking/droppedsmoking)自从我不抽烟已有10年了.①.我来上海已经4年了。It's/hasbeenfouryearssinceIcametoShanghai.【结论】since“自从……以来”；是现在完成时的标志。【注意】从句中延续性动词意义为否定。例：①我当医生已经3年了。(自从我成为医生以来，时间已经过去3年了。)ItisthreeyearssinceIbecamea

2、doctor②他不当医生已经3年了。Itisthreeyearssincehewasadoctor.③我父亲不吸烟已有两年了。Itistwoyearssincemyfathersmoked.④我父亲吸烟已有两年了。Itistwoyearssincemyfatherbegantosmoke.PracticeItisseveralmonths______thewholecountrystartedtotalkaboutwhetherdrivingafterdrinkingalcoholshouldbepunished.A.beforeB.untilC.sinceD.aft

3、er2.itis+时间+beforeI’msorryyou’vebeenwaitingsolong，butit’llstillbesometime____Briangetsback.A.beforeB.sinceC.tillD.afterbefore的有关句型Itwillbe+段时间+before+从句（一般现在时）“要过…..才”ItwillbefiveyearsbeforehereturnsfromEngland.Itwon’tbelongbefore+从句（一般现在时）“不久…就会”,要不了……就能做Itwon’tbelongbeforeherecoversfr

4、omtheinjury.Itwas+一段时间+before从句(did)过了……做了……Itwas3yearsbeforeheregainedthelovefromhisparents.Itwasnot+一段时间+before从句(did)没过……做了……Itwasn’tlongbeforethewholenationroseuptodrivetheenemyoutoftheircountry.HerangoffbeforeIcouldanswerit.PracticeThefieldresearchwilltakeJoanandPaulaboutfivemonths

5、;itwillbealongtime_____wemeetthemagain.A.afterB.beforeC.sinceD.when---It’salongtime__________Isawyoulast.---Yes,andwhatapityitisnowthatitwillbealongtime_______weseeeachotheragain.A.before;sinceB.since;whenC.since;beforeD.when;before3.itis+时间+whensbwasabouttodo/wasdoing/wasgoingtodo/waso

6、nthepointofdoingsth…when…sbhadjustdone…whenWhydoyouwalkwhenyouhaveacar?---在．．．的情况下Howcanweexplainittoyouwhenyouwon’tlisten?---ifWhyareyouherewhenyoushouldbeinschool?---本该．．．而Practice5—Yourflightwasquitelatelastnight.—Yes,itwasmidnight__________ourplanefinallygottoJinan.A.thatB.whenC.sin

7、ceD.until4.Itis+时间+thatItwasabout600yearsago____thefirstclockwithafaceandanhourhandwasmade.A.thatB.untilC.beforeD.when巩固练习：A.填上适当的单词：Itisfiveyears______hefinishedhisresearch.Itwasfiveyears______hefinishedhisresearch.Itwasfiveyearslater___hefinishedhisresearch.Itwas5o’clock_____