原因、目的、结果状语从句

一、原因状语从句通常由because,since,as,for等词来引导。连词because,as,since,for的用法区别：because表示原因时，用法最为广泛，语气也最强。它所引导的从句可以放在主句之前或在主句之后。例：1)--Whyareyoualwayslateforschool?–Becausemyhomeisfarfromhere.你为什么总是迟到？因为我家太远。2)Hecan’tcometothepartybecauseheisbusy.因为他忙，所以不能来参加这个聚会。as在表示原因时，语气较强。它所引导的从句常放在主句之前，意思是“由于”；把众人所知的事实当作理由。例：1)Asthebadweather,hewaslosthiswayyesterdaymorning.由于恶劣的天气，他昨天早晨迷路了。2)AsMr.Liuisthenewcomer,hedoesn’thavetoomanyfriendshere.刘先生由于初来乍到，因此在这儿没有太多的朋友。since语气较弱。它所引导的从句一般放在主句之前，意为“既然”；就对方陈述的事实作为理由。例：1)SinceLiMingdoesn’tknowtheanswerstotheproblems,let’saskWangLeitodoit.既然李明不知道这道题的答案，那就让王磊来回答吧。2)Sincewearegoodfriends,pleasecallmeifyouneedhelp.既然我们是好朋友，如需要帮助，请尽管打电话。相比较而言，for的语气最弱。其引导的从句放在主句之后，所表述的理由是对某一事实进行推断。例：1)Hethankedmeformyhelp.他因为我帮助了他而感谢。2）Thewomandidn’tbuythatcoatforitistooexpensive.那位女士没有买那件上衣是因为它太贵了。二、目的状语从句一般由inorderthat,sothat来引导。二者都表示“以便、为的是”之意。此时，句中往往会用一些相关的情态动词来加以说明。例：1)I’llhavetorunfastsothatIcancatchupwiththeminashorttime.(目的)我得快跑以便我能在短时间内赶上他们。2)Iopenedthewindowsothatfreshaircouldcomein.(目的)我把窗户打开以便新鲜空气可以进来。3)Wewilltellyoueverythingaboutitsooninorderthatyoucanprepareforthat.不久我们将会让你知道详情,以便你能够做准备。(目的)三、结果状语从句通常由连词so…that,such…that引导。二者都表示“如此…以至于”之意。例：1)Theteacher’steachingwassointerestingthatallthestudentswereveryexcited.老师讲课非常有趣，学生们都感到很兴奋。2)Jackstudiessohardthathealwaysmakesprogress.杰克学习很是努力，结果他不断取得进步。3)It’ssuchanicedaythatallofuswanttogocamping.天气是如此的好，我们大家都想去野营。●so…that…与such…that…的用法区别：so+形容词或副词+that+从句such+形容词+a(an)+单数可数名词+that+从句。但是这两种句型往往可以互换。例：1)Mygrandfatherissokindthateveryonelikestalkingwithhim.(=Mygrandfatherissuchakindpersonthateveryonelikestalkingwithhim)我爷爷心地善良，大家都喜欢和他聊天。2)ItissocoldthatIhavetowearwarmclothes.(=ItissuchcoldweatherthatIhavetowearwarmclothes.)天气如此的冷，以至于我不得不穿上暖和的衣服。专项练习一、选择恰当答案。1.Pleasespeakloudly_____allofuscanhearyou.A.sothatB.ifC.whenD.although2.HelearnedalittleJapanese_____hewasatmiddleschool.A.thoughB.althoughC.asifD.when3.Shewas_____tired_____shecouldnotwalkanymore.A.very,thatB.such,thatC.so,thatD.so,as4.Iwenttoschoolinahurry_____Iwouldn'tbelateforclass.A.sinceB.sothatC.asifD.unless5.Thechildwas__earlyinthemorning.A.enoughexcitedtogetupB.tooexcitedtogetupC.soexcitedthathegotupD.veryexcited,hegotup6.Bringitnearer_____Icannotseeitclearly.A.althoughB.sothatC.becauseD.since7.Itwas____thatshecouldn’tfinishitbyherself.A.sodifficultaworkB.suchadifficultworkC.sodifficultworkD.suchdifficultwork8.Hecan'tbuythecar___itwastooexpensive.A.forB.whenC.thatD.if9.Iarrivedthere___late___Ididn'tmeethim.A.too;toB.such;thatC.so;thatD.so;as10.Itis___hotintheroom___wehavetousethefans.A.such;thatB.so;thatC.as;asD.such;as11.___youhavenotime,Ihavetoasksomeoneelsetoplayfootball.A.SoB.SuchC.SothatD.Since12.Liftitup___Imayseeit.A.thoughB.sothatC.asD.than13.Ithinkweshouldgobyplane___wecangetthereearlier.A.assoonasB.whereC.inorderthatD.as14.Lilywenttoseethedoctoryesterday___shewasill.A.becauseB.butC.untilD.if15.I'dliketogoswimmingnow_____itisveryhot.A.forB.becauseC.ifD.whether二、将下列句子已成英文。1、他太高兴了，以至于说不出话来。Hewassoexcitedthathecouldsaynothing.2、因为他就住在河边，因此很擅长游泳。Becausehelivesbytheriver,heisverygoodatswimming.3、刘翔刻苦训练跑步以便能在2008年的奥运会上取得好成绩。LiuXiangpracticesrunninghardsothathecangetgoodachievementsintheOlympicGamesin2008.4、这个树太高，我爬不上去。ThetreeissotallthatIcan’tclimbitup.