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until直到。。。/not….until期末考试36.IwatchedtheWorldCupinabarandI_________home________1:00inthemorning.A.go;untilB.didn’tgo;untilC.went;untilD.havegone;untiluntil：表示动作、状态的持续，强调主句的动作或状态一直持续直到从句的动作发生，常与表示延续性动作的动词连用。Iwaiteduntil3o’clockinthemorning,buthedidn’tcomeback.Helivedwithhisparentsuntilheleftforcollege.not…until:表示“到。。为止”，“直到。。。才”，常与瞬间性动词连用。Thenoiseofthestreetsdidn’tstopuntilmidnight.Ididn’tstartedtosinguntilhefoundmytalent(才能).练习：理解并翻译下列句子：1.Theytalkeduntildawn.(黎明)2.Wewon’tstartuntilTomcomes.3.Shedidn’tarriveuntil6o’clock.4.Don’tleavetheroomuntilyourparentstoldyouto.5.WaituntilIcall.改正有错误的句子：1.Myfathercamebackuntilmidnightyesterday.2.TomwatchedTVuntilhefinishedhishomework.3.TomwatchedTVuntilhismothertoldhimtostop.4.Iwenthomeuntilitstoppedraining.5.TheystoppedtalkinguntilCiscacamein.条件状语从句由引导词if、unless或其他引导词引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。（注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态，从句要用一般将来时一般现在时,祈使句或情态动词[主将从现原则]。一、由if引导的条件状语从句：判断下列句子是否为条件状语从句：1.IfIfailthemathtest,Iwilltakeitagain.2.Therewon’tbeanyfoodleftinthecafeteriaifyoucomeat12:30.3.IwillgivethislettertoGinaifIseehernexttime.4.Ifhestealsthings,takehimtothepolicestation!5.IfIlearnfromthisteacher,Imaybethebeststudentintheclass.6.Idon’tknowifIcanfinishthisworkontime.7.I’mnotsureifthisisTom’sdictionary.8.YoucanlearnEnglishwellifyouworkhard.完成book2p33exercise7b&7cunless（除非，如果不。。。）引导的条件状语从句（仍遵循主将从现原则）理解并翻译下列句子：1.Unlesssheaskssomeonetocomewithher,herparentswon’tallowhertogotoBrazil.2.Unlessthegirlrunsveryfast,shemaynotcatchthebus.3.Unlesswedosomethingnow,therewillbemoreandmoretrafficjamsandtemperatureswillcontinuetorise.4.Youcan’tvisitthehistorymuseumunlessitisWednesday.填入正确形式的词1.We_____(not)understandthisquestionunlessourteach___________(explain).2.Unlesshe________(study)harder,he_________(fail)thistest.3.Iftherain_______(notstop)inanhour,we_______(belate)forschool.4.Allofus__________(besafe)ifnobody_________(know)oursecret.5.I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks6.–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit____.A.isn’trainB.rainC.won’trainD.doesn’train7.—Doyouknowwhenhewillcomebacktomorrow?--Sorry,Idon’tknow.Whenhe____back,I’lltellyou.A.comesB.willcomeC.comeD.maycome