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1、if引导的条件状语从句课件位置:从句可放在主句之前或之后,但是放在主句之前须有逗号隔开eg:如果我有足够的钱,我就去环游世界定义:if“如果,假如”它引导的句子表示某事发生所需的条件,即“在…条件下,某事才能发生”,在句子中充当状语,因此称之为条件状语从句。(If引导的条件状语从句表示假如有从句的动作发生,就会有主句动作的发生)IfIhaveenoughmoney,Iwilltravelaroundtheworld=IwilltravelaroundtheworldifIhaveenoughmoneyIfitrainsto
2、morrow,Iwillstayathome.一、什么是条件状语从句?IfIgetuplate,Iwillbelateforschool.IfIdon’tfinishmyhomework,Iwon’tgotobed.Ifyoujointheband(乐队),youwillbefamous.主从句的时态?练一练:1。如果她早点儿起床,就有时间在家里吃早餐Ifshe________alittleearlier,she’llhavetimetoeatbreakfastathome.2。如果你参加聚会,你将会过得很开心。Ifyou
3、____theparty,you_________agreattime.3。如果明天下雨,我们将不去野餐Ifit____tomorrow,we_______forapicnic.4。如果你经常听英文歌,你将会喜欢英语Ifyouoften_______Englishsongs,you______English.getsupjoinwillhaverainswon’tgolistentowilllike1.Ifhe____________(not,do)it,I___________(do)it.2.Ifyou____(be)
4、lateforschool,myteacher________(be)angry.arewillbe3.Ifshe________(win)theprize,we_______(be)happy.winswillbe4.IfI_________(not,eat)somuch,I_________(get)thinner.5.Ifyou______(tell)them,they_____________(not,believe)you.don’teatwillgettellwon’tbelievedoesn’tdowilld
5、o用所给单词的正确形式填空:6I_________(stay)athomeifit__________(rain).7.Ifit____________(not,rain),I_________(go)out.8.we__________(play)footballifitis_________(sun).9.Ifshe__________(become)astar,herparents____________(be)proudofher.10.He_________(watch)TVifhe______(be)free.
6、willstayrainsdoesn’trainwillgowillplaysunnybecomeswillbewillwatchis2.If从句(一般现在时),主句(一般现在时)表示科学常识、事实、经常性的动作或倾向自动会发生的事1.Ifwaterisheated,itturnstosteam.2.Ifpeopledon’tgetenoughsleep,theirthinkingabilityisreduced.3.IfIneedahaircut,Iusuallygotothebarber’snearwhereIliv
7、e.4.Peopleoftendon’tgooutonSundaysifitrains.1.as(so)longas….“只要…,就…”表示一种前提条件You’llsucceedas(so)longas(ifonly)youtryhard.只要你努力,你就会成功。拓展:那么,除了if之外,是否还有其他连词可以引导条件状语从句呢2.unless.除非;若不;如果不……;除非在……时候1.Youwillfailtoarrivethereintimeunlessyoustartearlier.如果你不早点动身,你就不能及时赶到那
8、儿。2.Unlessbadweatherstopsme,Igoforawalkeverymorning.除非天气不好,我每天早晨都要去散步。3.Iwon‘tloanyouunlessyouareinextremeneedofmoney.若不是你急需用钱,我不会借钱给你的。中考真题:(2011安徽)1.I