原因状语从句ppt课件

原因状语从句,概念,表示主句动作发生原因的句子,Mymoyherdoesntgotoworkbecausesheisill.As(由于)wehavenomoney,wecantbuyit.Nowthat（既然）youarehere,youdbetterstayhere.,区分because，as,since,for,because,表直接原因，语气最强，放主句前后都可，常回答why引导的问句Theywenttoschoolbybusbecauseitwascheap.since表示已知的，显然的理由或原因，意思是既然，较正式，语气比because弱Sinceyoudonttrusthim,youshouldnotemploy(雇佣)him.,as附带说明的双方已知的原因，语气比since弱，位置灵活Asitisdark,youdbetternotgoout.for表示不知道的原因，语气最弱，位于主句之后，对前面内容进行补充及解释说明Mr.Greenmustbeill,forheisabsent(没出席的)today.,注意三个问题,1，because和so不能连用，二者只能出现其一Becausesheisill，mymoyherdoesntgotowork.Sheisill，somymoyherdoesntgotowork.,2,because和becauseof的区别及转换because+句子becauseof+名词代词动词ingHecantcomebecausetheweatherisbad.Hecantcomebecauseofthebadweather.,.用because或becauseof填空1.Istudyhard_Iwanttobeateacherinthefuture.2._heistired,hedoesnotwanttogoshoppingwithus.3.Youlaughloudly_this?4.Thematchwasputoff_theheavyrain.5._thestorm,hedidntgothere.,.单项选择()1Ilikerain_itmakesmefeelcoolandrelaxed.SodoI.AorB.soC.butD.because()2.Ididntaccepthishelp_Iwantedtotryitmyself.A.becauseB.thoughC.untilD.unless,D,A,单元语法聚焦四,()3.ThetrafficpolicemantookawayJimsdriverslicense_hebrokethetrafficrulesofdrunkdriving.A.thoughB.becauseC.tillD.and()4.Rulesarehelpfultous，_wehavetofollowthem.A.soB.butCorD.because,B,A,单元语法聚焦四,()5._heexerciseseveryday,_heisveryhealthy.A.Because;soB.Because;thoughC.Because;/D.Though;/()6.Wehavetoputoff_oursportsmeeting_thebadweather.Ahold;becauseBhold,becauseofCholding;becauseDholding;becauseof,C,D,单元语法聚焦四,1.Hehastogetupearly_thebadweather.A.becauseB.soC.becauseofD.asaresult2.Hedidntstudyhard_hefailedtheexam.A.forB.asC.becauseD.so3.Theyarrived_theairportat8:00thismorning?A.atB.toC.inD.on4.MyclassmatesandIhad_funintheschooltrip.A.lotsofB.alotC.manyD.few,C,D,A,A,()7.Whydoyoulikeyourhistoryteacher?_heisveryfriendlyandkindtous.ABecauseBWhenCButDWhat()8.Someofthestudentsarenearsighted_theyspendtoomuchtimewatchingTVorplayingonlinegames.AwhenBthoughCbecauseDunless,A,C,单元语法聚焦四,9.Hehastogetupearly_thebadweather.A.becauseB.soC.becauseofD.asaresult10.Hedidntstudyhard_hefailedtheexam.A.forB.asC.becauseD.so11.Theyarrived_theairporta