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1、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：becausesinceasI cant get to sleep because of the noise outside. 由于外面声音嘈杂我睡不着。Since As weve no money, we cant buy it. 由于我们没钱，我们无法购买它。Now that you are here, youd better stay. 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、bec
2、ause“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.-Whydidnthecomeyesterday?-Becausehewasill.He cant come because he is ill. / He cant come because of his
3、illness. 他因病不能来此外，在强调句型中，只能用because。例如： It was because I missed the early bus that I was late for school. 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,youdbetternotgotowork.Since he asks you, youll tell him why. 他既然问你，那就告诉他为什么吧。 Since
4、 everyone is here, lets start. 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.We all like her as she is kind. 我们都喜欢她，因为她善良。 As I had a cold, I was absent from sch
5、ool. 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.Ididntgotoschoolyesterday_Iwasill.2._everybodyishere,letsbeginourmeeting.3._yo
6、uareinpoorhealth,youshouldnotstayuplate.4.Iaskedhertostaytotea,_Ihadsomethingtotellher.5._allthepassengersarehere,whydontwestartatonce?6.Billwontmakeanyprogress_hedoesntstudyharderthanbefore.7.Hemighthavegonetobed,_thelightwentout.1.because 2.Since 3.As 4.because 5.Since 6.because 7.for 1._youdonotu
7、nderstand,Iwillexplainagain.2._Janewastheoldestinthisfamily,shehadtolookaftertheothers.3.Hemustbeill,_heisabsenttoday.4.Theteachermustbestrictwithyou_theywantyoutomakegreatprogress.5._yourfatheriswellagain,younolongerhaveanythingtoworryabout.6.Thedaybreaks,_thebirdsaresinging.7._youareill,youdbetter
8、gotoseethedoctor.8._shewaslateforclass,shehadtosaysorry.1.since 2. As 3. for 4. because 5. Since 6. for 7. Since 8. As二、选择恰当的答案1.Themancantgetonthebus_thereisnoroomonit.A.though B.Because C.until Dsothat2._herdaughterhadntcomeback,_shelookedworried.A.Because,/ B.Because,so C.Though,but D.Though,/3._
9、youvegotachance,youmightmakefulluseofit.A.Nowthat B.After C.Although D.Assoonas4.Hefounditdifficulttoread,_hiseyesightwasbeginningtofail.A.And B.for C.but D.or5.Amancannotsmilelikeachild,_achildsmileswithhiseyes,whileamansmileswithhislipsalone.A.so B.But C.and D.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
10、动词发生的目的的状语从句。常用的连词有： that（以便），so that（以便）， in order that（为了；以便），Lest（免得;唯恐）， for fear that（生怕；以免） Say it louder(so)that everyone can hear you.大声说，以便大家都能听到你。 I am telling you that lest you should make a mistake. 我告诉你这一点，以免你搞错。 You must speak louder so that /in order that you can be heard by all.He wr
11、ote the name down for fear that(lest) he should forget it.Betty takes more clothes in case the weather is cold.学习目的状语从句应注意以下:(1)目的状语从句中常含有can,could,may,might,should等情态动词。I got up early so that I could catch the first bus.我起得很早，目的是为了赶上头班公共汽车。(2)在口语中so可以引导目的状语从句。Well sit nearer the front so we can hea
12、r better.我们坐的靠前一点，因此，我们听得清楚一点。【注意】in order that与in order to的区别:in order that+从句in order to+动词原形 ( in order to后面加的那个不叫目的状语从句，叫目的状语)in order to 为了，后接动词原形，做目的状语。I get up early in order to catch the early bus.in order that 为了，后接从句，做目的状语。I get up early in order that I can catch the early bus.如果表示“为了， 以便”
13、的目的状语从句的主语与主句的主语相同， 可用in order to或 so as to取代该目的状语从句， 注意体会以下例句： He hurried through his work in order to catch the train. 他匆匆干完手中的活， 为的是能赶上火车。I came so early as to catch the first train. 我起得早， 以便能赶上头班火车。考题1 Id like to arrive 20 minutes early _ I can have time for a cup of tea. (2005北京) A. as soon as B. as a result C. in case D. so that 答案 D 考题2 Roses need special care _ they can live through winter. (2004) A. because B. so that C. even if D. as 答案 B 考题3 Leave your key with a neighbor _ you lock yourself out one day. (2007 A. ever since B. even if C. soon after D. in case
