before用法小结.ppt

before用法小结,Before用作连词，其基本词义是“在-之前”，用来表示时间或顺序。如：Turnthelightoffbeforeyousleep.睡前先把灯熄掉Thinkbeforeyouspeak.说话之前应先想清楚但在不同的语境中before有不同的翻译,Before表示“不等-就-/尚未-就-”.-whydidntyoutellhimaboutthemeeting?-Herushedoutoftheroom_Icouldsayaword.(我还没来得及说他就冲出了房间)A.beforeB.untilC.whenD.after,before,._Icouldgetinaword,hehadmeasuredme.我还没来得及插上话，他就给我量好了尺寸A.AfterB.WhenC.sinceD.before.Thephonestoppedringing_IAnsweredit.(我还没来得及接，电话就挂断了)A.untilB.whileC.beforeD.after,2.Before表示“不知不觉，还没弄清就-”此意常用于beforesb.know/realise-TimepassedquicklyandthreemonthswentbybeforeIknewit.(时间飞快流逝，不知不觉3个月过去了)SeveralweekshadgonebybeforeIrealisedit.(不知不觉几个周就过去了),3.Before表示“以免，不然，趁-还没”Itscloudy.TakeanumbrellabeforeYouregretit.(带把伞吧以免后悔)IllcallhimbeforeIforget.(趁着还没忘记我就给他打个电话)Putthatawaybeforeitgetsbroken.(把它收好，以免砸了),4.Before用于这两个句型：Itwas/wasnt+一段时间+before从句（过了多久/没过多久才-）Itwill/wont+一段时间+before从句（还得过多久/用不了多久就-）Itwasalongtimebeforewemetagain.过了很久我们才再次见面区别：Itis+一段时间+since从句,Itwasnt3yearsbeforewemetagain.(没过3年我们就又见面了)Itwillbetwoyearsbeforewemeetagain.(还要过两年我们才能见面)Itwontbelongbeforeyouregret.（用不了多久你就会后悔）Wedidntwaitlongbeforehecameback.(我们没等多久他就回来了),5.Before表示“宁可-而不愿-”IddiebeforeIapologizedtothem.(我宁死也不向他们道歉)Theywouldfighttodeathbeforetheysurrendered.(他们宁死也不投降)Wewilldiebeforewegivein.(我们宁死不屈),巩固性练习1.Ascientistmustpractisealot_hecanusealldatatoolswell.A.assoonasB.whenC.untilD.before2._sherealizedwhatwashappening,shewashitoverthehead.A.WhenB.beforeC.sinceD.as,B,D,3.whydidntyouhelpthelittleboy?-Oh,sorry.Hehadstruggledtohisfeet_Iranover.A.untilB.afterC.beforeD.since4.Hemadeamistake,butthenhecorrectedthesituation_itgotworse.A.untilB.whenC.beforeD.as,C,C,5.Scientistssayitmaybe5years_itispossibletotestthismedicineonhumanpatients.A.SinceB.afterC.beforeD.when6.Someonecalledmeupinthemiddleofthenight,buttheyhungup_Icouldanswerthephone.A.asB.sinceC.whileD.before,C,D,7.Youdbettergiveitup_itistoolateasitsverydangerous.A.beforeB.asC.whenD.since8.Itwouldbemonths_hewasfitforwork.A.untilB.sinceC.beforeD.after,A,C,9.Itwasevening_wereachedthelittletownofWinchester.A.thatB.untilC.sinceD.b