初中if引导的条件状从ppt课件

.,1,If引导条件状语从句,GRAMMAR：,.,2,e.g.HespeaksEnglishfluently.Wesleepatnightathome.Icomespeciallytoseeyou.Tenyearsago,ShebegantoliveinDalian.Weshouldservepeopleheartandsoul.Whenshewas12yearsold,shebegantoliveinDalian.,句子中表示地点、时间、原因、目的、结果、条件、方向、程度、方式和伴随状况等的成分,状语一般由副词、介词短语、分词和分词短语、名词、不定式,句子等来担当。,什么是状语？,.,3,什么是状语从句？,用一个句子充当状语成分，那个句子就是状语从句。,Igetup,atsix,whenitisdark.,Igetup,atschool,whereIstudy.,.,4,1.时间状语从句2.条件状语从句3.比较状语从句4.结果状语从句5.原因状语从句6.目的状语从句7.让步状语从句8.方式状语从句9.地点状语从句,状语从句,.,5,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，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=IwilltravelaroundtheworldifIhaveenoughmoney,Ifitrainstomorrow,Iwillstayathome.,一、什么是条件状语从句？,.,6,IfIgetuplate,Iwillbelateforschool.IfIdontfinishmyhomework,Iwontgotobed.,Ifyoujointheband(乐队),youwillbefamous.,主从句的时态？,.,7,1.If条件句：在if引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实以其产生的相关结果，从句用_,主句用_.,运用“主将从现”的原则。,一般现在时态,一般将来时态,.,8,用法：1.如果主句是一般将来时，从句则用一般现在时。Ifitrains（从句），Iwillstayathome.Illgowithyouifyoudontwanttogoalone（从句）.2.如果主句含有must,may,can等情态动词，从句也要用一般现在时。Ifyoudrivetoofast,youmayhaveanaccident.Youmuststopifthetrafficisred.Ifyoufinishthehomework，youcangohome如果你作业做完了就可以回家了。Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想减肥，你必须少吃面包。,.,9,3.如果主句是祈使句，从句同样要用一般现在时。Dontgoandplayfootballifyoudontfinishyourhomework.PleasecallmeifhecomesnextSunday.,.,10,练一练：1。如果她早点儿起床，就有时间在家里吃早餐Ifshe_alittleearlier,shellhavetimetoeatbreakfastathome.2。如果你参加聚会，你将会过得很开心。Ifyou_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.,getsup,joinwillhave,rainswontgo,listentowilllike,.,11,1.Ifhe_(not,do)it,I_(do)it.,2.Ifyou_(be)lateforschool,myteacher_(be)angry.,are,willbe,3.Ifshe_(win)theprize,we_(be)happy.,wins,willbe,4.IfI_(not,eat)somuch,I_(get)thinner.,5.Ifyou_(tell)them,they_(not,believe)you.,donteat,willget,tell,wontbelieve,doesntdo,willdo,用所给单词的正确形式填空：,.,12,6I_(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.,willstay,rains,doesntrain,willgo,willplay,sunny,becomes,willbe,willwatch,is,.,13,2.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.Ifpeopledontgetenoughsleep,theirthinkingabilityisreduced.3.IfIneedahaircut,IusuallygotothebarbersnearwhereIlive.4.PeopleoftendontgooutonSundaysifitrains.,.,14,1.as(so)longas.“只要，就”表示一种前提条件,Youllsucceedas(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,.,15,2unless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儿。2.Unlessbadweatherstopsme，Igoforawalkeverymorning除非天气不好，我每天早晨都要去散步。3.Iwontloanyouunlessyouareinextremeneedofmoney若不是你急需用钱，我不会借钱给你的。,.,16,中考真题：,（2011安徽）1.Iftherain_(stop)tonight,wewillgotothecinema.（2012黑龙江）2.IllbuyacomputerifI_(have)enougmoney.（2013内蒙古）3.You_(notget)nervousifyou_(do)enoughexercise.（2014浙江）4.Ifshe_(be)kindtome,I_(notargue)withher.,stops,have,wontget,do,is,wontargue,.,17,分析试题特点及做题思路：,1.考连词-做题思路：分析句子-判断关系-选择正确的连词：1.Youwontgetnervous_youdoenoughexercise.A.if,B,unlessC,whether2._youhurryup,youwillmisstheearlybus.A.if,B,unlessC,whether,分析试题特点及做题思路：,.,18,2.Youmay_(pass)theexamifyou_(study)hard.,2.考时态-做题思路：认字-判断语境提供的时态特点-选择正确的时态,A.rain,stayB.rains,stayC.rains,willstayD.rain,willstay,1.IfIt_(rain)tomorrow,I_(stay)athome.,A.pass,studyB.willpass,studyC.pass,willstudyD.passes,study,.,19,IfImill,_.,Iwillseeadoctor,Lookandsay,IfImlate,_.,Iwillsaysorry,条件状语从句在日常生中的应用：,.,20,IfImhungry,Iwill_.,IfImtired,Iwill_.,Lookandsay,eatsomefood,havearest,.,21,Ifitrainstomorrow,I_.,willwatchTVathome,Ifit_tomorrow,_.,Illplaybasketball,doesntrain,.,22,if条件句不一般,几个要点记心间;条件句,放在前,逗号要放句中