条件状语从句

条件状语从句定义：在复合句中做条件状语的从句称为条件状语从句。弓I导词：if,unless,so/aslongas,onconditionthat,incase,once等。条件句的分类：真实条件句：有可能实现的条件。非真实条件句：条件不可能实现或实现的可能性极小（用虚拟语气）（高中内容）。常见的都知道if引导的句子，“主将从现”，现在具体归纳一下总体的条件状语从句的用法。【语法点一】if引导的句式（结果肯定出现）【语法点二】if引导的句式（结果可能出现）【语法点三】unless引导的句式【语法点四】so/aslongas引导的句式▲【语法点一】if引导的句式（结果肯定出现）常见句式：一般现在时+if+一般现在时Eg.Ifyoucoolwater,itturnsintoice.Ifyoudon’tgiveplantswater,theydie.Ifyouputwoodintowater,itfloats.▲【语法点二】if引导的句式（结果可能出现）常见的句式：一般将来时+if+一般现在时；即“主将从现”，此时if翻译为“如果”Eg.Ifitdoesn’traintomorrow,wewillgoforapicnic.Ifyouhurryup,youwillcatchtheearlybus.★【拓展一】在if引导的句式里，主句是含有情态动词以及主句是祈使句的情况。祈使句+if+一般现在时（主祈从现）Eg.Putupyourhandifyouhaveanyquestionstoask.Pleaseletmeknowifyoumeetanydifficulty.情态动词+if+一般现在时（主情从现）Eg.Youmustgotoseeadoctorifyouhaveafever.Ifthetrafficlightsturnred,allcarsandbusmuststop.★▲【拓展二】祈使句，and/or+句子（一般将来时），可以和if引导的句子相互转换,and表顺承关系，or表转折，翻译为“否则”Eg.Hurryup,andyouwillcatchtheearlybus.=Ifyouhurryup,youwillcatchtheearlybus.Studyhard,oryouwillfallbehindothers.=Ifyoudon’tstudyhard,youwillfallbehindothers.★【拓展三】if在宾语从句中，可译为“是否”，时态无限定。等同于whetherEg.Iamnotverysureifhewillcomethisevening.Themathteacherwondersifthesefiguresarecorrect.★▲【语法点三】unless引导的句式unless的意思是“除非”，相当于if not,因此unless与if not可以互换Eg.Youwillfailtheexamunlessyoustudyhard.=Youwillfailtheexamifyoudon'tstudyhard.Youwillbelateunlessyouarequicknow.=Youwillbelateifyouarenotquicknow.Mybabysisternevercriesunlesssheishungry.=Mybabysisternevercriesifsheisnothungry.Hewon'tgotoMary'spartyunlessheisinvited.=Hewon'tgotoMary'spartyifheisnotinvited.【语法点四】as/solongas引导的句式as/solongas意思为“只要"，区别于“和……一样长"Eg.AslongasIknowthemoneyissafe,Iwon'tworryaboutit.Aslongasitdoesn'train,wewillgotoplayfootball.一，单选( )1.IfIhisphonenumber,Iwilltellyou.A.findB.foundC.willfindD.havefound( )2.Wewillgocampingifittomorrow.A.Won'train B.didn'trainC.doesn'trainD.isn'training( )3.I'mwaitingformyfriend.Ifhe,Iswimmingalone.A.doesn'tcome;willgo B.won'tcome;willgoC.willcome;won'tgo D.don'tcome;willgo( )4.yougotothesupermarketat7p.m,youcanbuyalotofcheapfood.A.If B.Unless C.WhetherD.When( )5.Iwon'tgettothepartyontimeIcatchthefirsttraintomorrowmorning.A.If B.Unless C.WhetherD.When( )6. Shallwegoonapicnicthisweekend? Goodidea!UnlessitA.rains B.doesn'trainC.rainD.won'train( )7. CanIchangethejacketforanotheroneitdoesn’tfitmewell? Ofcourse.A.unlessB.if C.thatD.though( )8. ifIgetgoodgradesthistime,myparentsmetoHongKongforafive-daytrip.A.take B.takes C.took D.willtake二，用括号中所给动词的正确形式填空。Ifyou(be)happy,wewillbehappy.Jackwillmisstheearlybusifhe(notget)upearly.Ifthecomputer(notwork)properly,lefsrepairitatonce.IfI(notunderstand),Iwillaskmyteacherforhelp.Yourparentswillbeproudofyouifyou(go)touniversity.Unlessyou(come)beforeteno’clock,youwillnotseeme.Ifyou(press)theswitch,theTVwillbeonoroff.Youcan’taffordthehouseunlessyou(have)1,000,000yuan.Ifit(notbe)verycold,Iwillsleepwiththewindowopen.Jennywillvisithergrandmaifshe(be)freetomorrow.三，同义句转换，每空一词。IwillleaveifSandydoesn’tsaysorrytome.IwillleaveSandysorrytome.Ican’tmakeprogresswithmyEnglishunlessyouhelpme.Ican’tmakeprogresswithmyEnglishyoume.Ifyoudon’treadthemapcarefully,youwillbelostinthisstrangecity.readthemapcarefully,youwillbelostinthisstrangecity.一，完成句子如果他到的晚了会发生什么事情？Whatifhelate?如果努力学习，你就会取得好成绩。Ifyou,yougood.他如果看电视太久了，他的父母会不高兴。IfheTVtoomuch,hisparentsunhappy.如果你上课睡觉，老师会生气。Ifyouinclass,yourteacheryou.如果明天不下雨，我会和你一起去公园的。Ifittomorrow,Igototheparkyou.如果他有空，他会帮助你的。Ifhe,heyou.二单选( )1.Ifyoutotheparty,you’llhaveagreattimeA.willgoB.wentC.goD.going( )2.—Doyouknowwhenhewillcomebacktomorrow?--Sorry,Idon’tknow.Whenheback,I’lltellyou.A.comesB.willcomeC.comeD.maycome( )3.WhatwillfatherusfromJapan?A.takeB.bringC.carryD.make( )4.Whatwillyoudoifyoutotheoldfolk’shomevisit?A.goB.wentC.goingD.willgo( )5.Iherthea