原因状语从句一、引导原因状语从句的连词原因状语从句一般由从属连词because,as,since，nowthat引导。语气由强至弱依次为：because→since→asIcan’tgettosleepbecauseofthenoiseoutside.由于外面声音嘈杂我睡不着。Since[As]we’venomoney,wecan’tbuyit.由于我们没钱，我们无法购买它。Nowthatyouarehere,you’dbetterstay.你既然来了，最好还是留下吧(既来之，则安之)。二、because,as,since和nowthat的区别：1、because“因为”，表示直接的原因，语气最强。1）why提问的句子，必须用because回答。2）because的从句常放在主句之后。3）because不能与so连用。4）because+从句；becauseof+名词短语ImissedthetrainbecauseIgotuplate.Hewasangrynotbecausewewerelatebutbecausewemadeanoise.-Whydidn’thecomeyesterday?-Becausehewasill.Hecan’tcomebecauseheisill./Hecan’tcomebecauseofhisillness.他因病不能来此外，在强调句型中，只能用because。例如：ItwasbecauseImissedtheearlybusthatIwaslateforschool.我上学迟到是因为我没有赶上早班汽车。2、since/nowthat“既然”，语气比because稍弱，一般放在主句前，中间用逗号隔开，表示的是明显的原因或众所周知的事实。Since/Nowthatyoufeelill,you'dbetternotgotowork.Sinceheasksyou,you'lltellhimwhy.他既然问你，那就告诉他为什么吧。Sinceeveryoneishere,let'sstart.既然大家都到齐了，我们就出发吧！3、as“因为”，是常用词，语气最弱，它表示的“原因”是双方已知的事实或显而易见的原因，含义与since相同，但语气更弱，没有since正式，常译为“由于，鉴于”从句多放置主句前Ashewasnotwell,Idecidedtogotherewithouthim.Asitwasraininghard,wehadtobeindoors.Wealllikeherassheiskind.我们都喜欢她，因为她善良。AsIhadacold,Iwasabsentfromschool.因为我感冒了，所以没去上课。三、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，只能放在主句之后，不能放在句首，常用逗号把它和前面的分句隔开。对主句补充说明理由或推断原因。Itrainedlastnight,forthegroundiswet.Shemusthavegoneoutearly,forshehadnotcomeforbreakfast.Exercise:一、填入恰当的连词1.Ididn’tgotoschoolyesterday_________Iwasill.2.________everybodyishere,let’sbeginourmeeting.3.________youareinpoorhealth,youshouldnotstayuplate.4.Iaskedhertostaytotea,________Ihadsomethingtotellher.5.________allthepassengersarehere,whydon’twestartatonce?6.Billwon’tmakeanyprogress________hedoesn’tstudyharderthanbefore.7.Hemighthavegonetobed,________thelightwentout.1.because2.Since3.As4.because5.Since6.because7.for1.______youdonotunderstand,Iwillexplainagain.2.______Janewastheoldestinthisfamily,shehadtolookaftertheothers.3.Hemustbeill,______heisabsenttoday.4.Theteachermustbestrictwithyou______theywantyoutomakegreatprogress.5._____yourfatheriswellagain,younolongerhaveanythingtoworryabout.6.Thedaybreaks,_____thebirdsaresinging.7.______youareill,you’dbettergotoseethedoctor.8.______shewaslateforclass,shehadtosaysorry.1.since2.As3.for4.because5.Since6.for7.Since8.As二、选择恰当的答案1.Themancan’tgetonthebus______thereisnoroomonit.A.thoughB.BecauseC.untilDsothat2.______herdaughterhadn’tcomeback,______shelookedworried.A.Because,/B.Because,soC.Though,butD.Though,/3._______you’vegotachance,youmightmakefulluseofit.A.NowthatB.AfterC.AlthoughD.Assoonas4.Hefounditdifficulttoread,_______hiseyesightwasbeginningtofail.A.AndB.forC.butD.or5.Amancannotsmilelikeachild,________achildsmileswithhiseyes,whileamansmileswithhislipsalone.A.soB.ButC.andD.forBAABD目的状语从句目的状语从句:从句部分是用以补充说明主句中谓语动词发生的目的的状语从句。常用的连词有：that（以便），sothat（以便），inordertha...
