B4M3条件和让步状语从句

Grammar1Adverbialclauseofcondition,引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如:如果你请他帮忙,他会帮你的。Ifyouaskhim,hewillhelpyou.,if1)Ifhehadworkedharder,hewouldhavepassedtheexam.2)Ifyouworkharder,youwillsucceed.,Workharder,andyouwillsucceed.,Workharder,oryouwontsucceed.,Workingharder,youwillsucceed.,其他可引导条件状语从句的连词:,unlessconj.除非,若不,除非在的时候Youwillfailtoarrivethereintimeunlessyoustartearlier.如果你不早点动身,你就不能及时赶到那儿。Unlessitrains,thegamewillbeplayed.除非下雨,比赛将照常进行。,1)WecantwritetoMaryunlessshetellsusheraddress.,WecantwritetoMaryifshedoesnttellusheraddress.,2.oncondition(that).在条件下,如果;oncondition(that).引导的条件从句是主句事件发生的前提条件或唯一条件。Icantellyouthetruthonconditionthatyoupromisetokeepasecret.我可以告诉你真相,条件是你答应保守秘密。,Youcangoswimmingoncondition(that)youdontgotoofarfromtheriverbank.你只有在不远离河岸的条件下才可以下水游泳。3.supposingconj.如果,假如supposing引导的条件从句表示一种假设条件,Supposingitrains,shallwecontinuethesportsmeeting?倘若下雨,我们的运动会还要继续举行吗?Supposingsomethingshouldgowrong,whatwouldyoudothen?假如出了什么问题,你准备怎么对付?,4.providedconj.假如,除非,以为条件provided(that)+从句表示一种假设条件。Hewillsignthecontractprovidedweoffermorefavorableterms.如果我们提出更优惠的条件,他就会在合同上签字。,Hewontbeagainstusinthemeetingprovidedthatweaskforhisadviceinadvance.如果我们提前征求一下他的意见,他就不会在会上反对我们。,另外还有incase(如果，万一),as/solongas(只要)Incaseitrains,donotexpectme.如若下雨,就不要等我了。Aslongasyoupromisetocome,Illwaitforyouuntilyoucome.只要你答应,我就等你来。,从上述例句可以看出if,unless,oncondition(that),supposing,provided等词引导的条件状语从句,主从句条件关系分明,结构清晰。在条件状语从句中,用一般现在时代替一般将来时,一般过去时代替过去将来时。,但有些句子,虽没有含条件关系的连词,却也隐含着条件关系,这些句子常用一些词,如butfor,without等引出一个介词结构来表示条件,条件常常是虚拟的,或与事实相反的假设。如:,butfor若非,要不是,Butfortherain,weshouldhaveapleasantjourney.要不是下雨,我们的旅行肯定会很愉快。Butforyourhelp,weshouldnothavefinishedintime.要不是你帮忙,我们肯定不能及时完成任务。,1.Ifyou_acake,yourhost_verypleased.(take,be)2.Unlesstheweather_better,I_athome.(get,stay)3.He_homeearlyifhe_well.(go,notfeel),take,willbe,gets,willstay,goes,doesntfeel,IfIseeherIllinvitehertotheparty.(see,invite),Exercises,4.What_I_ifthey_aboutpolitics?(do,talk)5.Ifyou_yourhand,thetaxi_.(raise,stop)6.I_anythingunlesshe_me.(notstay,ask),raise,willstop,willnotsay,asks,shall,do,talk,Summary问题1：1、TheWTOcannotliveuptoitsname_itdoesnotincludeacountrythatishometoonefifthofmankind.（2000全国）AaslongasBwhileCifDeventhough2、Itisknowntoallthat_youexerciseregularly,youwontkeepgoodhealth.（05重庆卷）A.unlessB.wheneverC.althoughD.if,C,A,unless相当于ifnot，意思是“除非”“如果不就”。这也是高考的热点之一。复习时也应给予高度重视。,问题2：1、_Icansee,thereisonlyonepossiblewaytokeepawayfromthedanger.（04北京春季）A.AslongasB.AsfarasC.JustasD.Evenif2、IalwaystakesomethingtoreadwhenIgotothedoctors_Ihavetowait.（05全国卷3）AincaseBsothatCinorderDasif,B,A,aslongas与asfaras都可引导条件状语从句，aslongas表示“只要”，asfaras表示“就而论（而言）”。题1根据题意应该选用B。incase表示“以防”，根据题2的句意，不难作出选择。,Summary问题1：1、_Iacceptthatheisnotperfect,Idoactuallyliketheperson.（04江苏）A.WhileB.SinceC.BeforeD.Unless2、Allowchildrenthespacetovoicetheiropinions,_theyaredifferentfromyourown.(05湖南卷）(B)A.untilB.evenifC.unlessD.asthough,A,B,while是高考中的高频词，它既可引导时间状语从句，又可引导并列句，还可引导让步状语从句，表示“尽管”。evenif等于eventhough，表示“即使、尽管”。asthough等于asif，引导方式状语从句，表示“好像、似乎”。,问题2：1、Hetriedhisbesttosolvetheproblem,_difficultitwas.（05天津卷）A.howeverB.nomatterC.whateverDalthough2、Theoldtowermustbesaved,_thecost.（05浙江）AhoweverBwhateverCwhicheverDwherever,A,B,nomatterwh-与wh-ever的联系及区别：nomatterwh-只引导让步状语从句，此时与wh-ever通用。如:No