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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1.Before表示“不等---就---/尚未---就---”⑴.---whydidn’tyoutellhimaboutthemeeting?---Herushedoutoftheroom___Icouldsayaword.(我还没来得及说他就冲出了房间)A.beforeB.untilC.whenD.afterbefore⑵.____Icouldgetinaword,hehadmeasuredme.我还没来得及插上话，他就给我量好了尺寸A.AfterB.WhenC.sinceD.before⑶.Thephonestoppedringing____IAnsweredit.(我还没来得及接，电话就挂断了)A.untilB.whileC.beforeD.after2.Before表示“不知不觉，还没弄清就---”此意常用于beforesb.know/realise---⑴TimepassedquicklyandthreemonthswentbybeforeIknewit.(时间飞快流逝，不知不觉3个月过去了)⑵SeveralweekshadgonebybeforeIrealisedit.(不知不觉几个周就过去了)3.Before表示“以免，不然，趁---还没”It’scloudy.TakeanumbrellabeforeYouregretit.(带把伞吧以免后悔)I’llcallhimbeforeIforget.(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/wasn’t+一段时间+before从句（过了多久/没过多久才---）Itwill/won’t+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Itwasn’t3yearsbeforewemetagain.(没过3年我们就又见面了)Itwillbetwoyearsbeforewemeetagain.(还要过两年我们才能见面)Itwon’tbelongbeforeyouregret.（用不了多久你就会后悔）Wedidn’twaitlongbeforehecameback.(我们没等多久他就回来了)5.Before表示“宁可---而不愿---”I’ddiebeforeIapologizedtothem.(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.asBD3.–whydidn’tyouhelpthelittleboy?--Oh,sorry.Hehadstruggledtohisfeet_____Iranover.A.untilB.afterC.beforeD.since4.Hemadeamistake,butthenhecorrectedthesituation___itgotworse.A.untilB.whenC.beforeD.asCC5.Scientistssayitmaybe5years___itispossibletotestthismedicineonhumanpatients.A.SinceB.afterC.beforeD.when6.Someonecalledmeupinthemiddleofthenight,buttheyhungup_____Icouldanswerthephone.A.asB.sinceC.whileD.beforeCD7.You’dbettergiveitup___itistoolateasit’sverydangerous.A.beforeB.asC.whenD.since8.Itwouldbemonths___hewasfitforwork.A.untilB.sinceC.beforeD.afterAC9.Itwasevening___wereachedthelittletownofWinchester.A.thatB.untilC.sinceD.before10.Thescientistshadtriedoutmanykindsofchemicals____theyfoundtherightone.A.sinceB.afterC.beforeD.whenDC