原因状语从句语法讲解

1、A、引导原因状语从句的连词原因状语从句一般由隶属连词because,as,since，nowthat引导。B、because,as,since和nowthat的差异：1、because“因为”，表示直接的原因，语气最强。1）why提问的句子，必定用because回答。2）because的从句常放在主句此后。3）because不能够与so连用。4）because+从句；becauseof+名词短语ImissedthetrainbecauseIgotuplate.Hewasangrynotbecausewewerelatebutbecausewemadeanoise.-Whydidnthecome

2、yesterday-Becausehewasill.2、as“因为”，语气较弱，一般放在主句前，中间用逗号分开，表示的是明显的原因。Ashewasnotwell,Idecidedtogotherewithouthim.Asitwasraininghard,wehadtobeindoors.3、since/nowthat“既然”，一般放在主句前，中间用逗号分开，表示的是明显的原因或众所周知的事实。Since/Nowthatthismethoddoesntwork,letstryanother.Since/Nowthatyoufeelill,youdbetternotgotowork.C、for引

3、导的并列句与原因状语从句的辨析并列连词for“因为”，引导的不是从句，而是并列分句，只能放在主句此后，不能够放在句首，常用逗号把它和前面的分句分开。对主句补充说明原因或推断原因。Itrainedlastnight,forthegroundiswet.Shemusthavegoneoutearly,forshehadnotcomeforbreakfast.Exercise:一、填入合适的连词1.Ididntgotoschoolyesterday_Iwasill.2._everybodyishere,letsbeginourmeeting._youareinpoorhealth,youshould

4、notstayuplate.Iaskedhertostaytotea,_Ihadsomethingtotellher.5._allthepassengersarehere,whydontwestartatonce6.Billwontmakeanyprogress_hedoesntstudyharderthanbefore.7.Hemighthavegonetobed,_thelightwentout.二、改写句子,保持句意不变1)Theshipchangeditscoursebecausetherewasastorm.Theshipchangeditscourse_.2)Becausehewa

5、sill,hedidntgotoschool.Hewasill,_hedidntgotoschool.Hecouldntwalkbecausehislegwasbroken.Hecouldntwalk_his_leg.Icamebackbecauseitwasrainingheavily.Icameback_the_rain.三、课堂小结：_四、回家作业：一、填入合适的连词_youdonotunderstand,Iwillexplainagain._Janewastheoldestinthisfamily,shehadtolookaftertheothers.Hemustbeill,_heis

6、absenttoday.4.Theteachermustbestrictwithyou_theywantyoutomakegreatprogress._yourfatheriswellagain,younolongerhaveanythingtoworryabout.Thedaybreaks,_thebirdsaresinging._youareill,youdbettergotoseethedoctor._shewaslateforclass,shehadtosaysorry.二、选择合适的答案Themancantgetonthebus_thereisnoroomonit.thoughB.b

7、ecauseC.untilDsothat_herdaughterhadntcomeback,_shelookedworried.Because,/B.Because,soC.Though,butD.Though,/youvegotachance,youmightmakefulluseofit.A.NowthatB.AfterC.AlthoughD.AssoonasHefounditdifficulttoread,_hiseyesightwasbeginningtofail.andB.forC.butD.orAmancannotsmilelikeachild,_achildsmileswithh

8、iseyes,whileamansmileswithhislipsalone.soB.butC.andD.for五、学生反响：（在完成回家作业的过程中存在的问题）_六、教师反响：（在批阅学生回家作业中发现的问题）_Keys：A、引导原因状语从句的连词：because,as,since，nowthatB、because,as,since和nowthat的差异：1、because：“因为”，表示直接的原因，语气最强。1）why提问的句子，必定用because回答。2）because的从句常放在主句此后。3）because不能够与so连用。4）because+从句；becauseof+名词短语2、as：“因为”，语气较弱，一般放在主句前，中间用逗号分开，表示的是明显的原因。3、since/nowthat：“既然”，一般放在主句前，中间用逗号分开，表示的是明显的原因或众所周知的事实。C、for引导的并列句与原因状语从句的辨析：并列连词for“因为”，引导的不是从句，而是并列分句，只能放在主句此后，不能够放在句首，常用