英语优质公开课课件精选——《If 引导的条件状语从句》

《If引导的条件状语从句》执教教师：XXX重点、难点1.if引导的条件状语从句的概念和结构2.含有if引导的条件状语从句的复合句中主从句的时态。3.If引导的宾语从句与条件状语从句的区别。考情分析通常在单项选择、完形填空或补全、完成句子等题型查，分值约3—4分。IfIgetupat7:00,Iwillbelate.IfIamlate,theteacherwillbeangrywithme.Iftheteacherisangrywithme,Iwillbesad.If引导条件状语从句一，定义：if“如果,假如”它引导的句子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。Ifyougetuplate,youwillbelateforschool.Lookandsay例句IfIhaveenoughmoney,Iwilltravelaroundtheworld：二.if引导的条件状语从句位置→从句→主句IwilltravelaroundtheworldifIhaveenoughmoney..原句可改为：if引导的条件状语从句既可以放在句子前，也可以放在句子后。从句位于主句之前时，常用逗号将其与主句隔开。结构：__________________ifI’mill.IwillseeadoctorLookandsayIfI’mlate,_________________.Iwillbepunished.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例如：Wewillgototheparkifit_____________(rain)tomorrow.三，含if条件状语从句的主从复合句的时态1.if条件状语从句中，主句用一般将来时，从句用___________表示将来________原则。doesn’t主将从现rain一般现在时Itisgoingtoraintomorrow.  Iwillstayathome.Ifit_____tomorrow,I__________athome.rainswillstayHewon’tstudyhard.Hewillfailintheexam.“Ifhe_______studyhard.He_________intheexam.”doesn’twillfailIfIhavemuchmoney,Iwill…………travelallovertheworld.buylotsofdeliciousfood.2.if条件状语从句中，如果主句有must，can，may等情态动词，从句用___________。例如：Youmuststopifthetrafficlight____(be)red.is一般现在时“主情从现”Ifyoufeelhungry,youshouldeatsomething.Ifyoufeeltired,youmusthavearest.例如：Don’twaitformeifI_____(be)late.3.if条件状语从句中，主句是祈使句，从句用____________表示将来。_________原则。am主祈从现一般现在时if引导的条件状语从句时态主将从现祈使句情态动词IwillsingasongifIamhappy.Don’tcrosstheroadifthelightisredYoumuststopifthetrafficlightisred.2.Ifit____(be)coldtomorrow,Iwillwearmysweater.3.Hecangohomeifhe________(finish)hishomework.finishes1.Putupyourhandsifyou_____(have)anyquestions.haveis注意事项1.在if引导的条件状语从句中，当主句是一般将来时时，不能够使用begoingto结构，而要用will。例如：I’llhelpyouwithyourEnglishifIamfreetomorrow.如果明天我有空，我会帮你学英语。2.在if引导的条件状语从句中不能够使用some，而要用any。例如：Ifyouhaveanyquestionstoask,pleasecometomyoffice.如果你有问题要问的话，请到我办公室来。　　四、if的两面性　　if引导条件状语从句时意为“如果”，如果引导宾语从句则意为“是否”，放在谓语动词之后。请比较：　　1)Wewillgooutifitisfinetomorrow.　　2)Idon’tknowifthetrainhasarrived.　　AjokeAmanlikedagirlverymuchandaskedifthegirlcouldmarryhim.Butthegirldidn’tagree.Shesaid,“ifthereisonlyonemanleft,Iwillmarryyou.”Part1:If的用法1.Iwanttoknowifhewillgotoaparkwithus.2.Wewillhaveapicnicifitdoesn’train.3.Canyoutellmeiftherewillbeaconcerttomorrow?4.Ifyoufeeltired,youmusthavearest.宾语从句条件状语从句条件状语从句宾语从句BettywillvisittheHistoryMuseumifit____________(rain)tomorrow.Benwantstoknowifit___________(be)finetomorrow.If引导的条件状语从句应遵从主从句是时态相呼应原则，不用一般将来时If引导的宾语从句主句是一般现在时态，if引导的宾从该用什么时态就用什么时态。doesn’trainwillbe是否如果Exercises:Hewillhelpmewithmymathsifhe____free.AwasBwillbeCwouldbeDis2.Pleasetellhermytelephonenumberifshe_____(want)toknow.wantsDD3.Idon’tknowifmyuncle_____.Ifhe___,Iwillbeveryhappy.Acomes;willcomeBwillcome;willcomeCcomes;comesDwillcome;comesD()4.Ifit______sunnytomorrow,I____boating.A.isgoB.willbe,goC.is,willgoD.willbe,willgo()5.--whatwillyoudoifit______tomorrow,--I’llstayathomeandwatchTV.A.rainB.rainsC.willrainD.israiningCBif条件句不一般,几个要点记心间; 条件句,放在前,逗号要放句中间。 条件句表可能，主将从现不一般；条件句表事实，主句常用现在时If还有“是否”意,宾语从句放后边summaryifwillshe,callme,I,tellheraboutitIfshecallsme,Iwilltellheraboutit.he,come,nextweekend,I,tellyouIfhecomesnextweekend,Iwilltellyou.notrain,gohiking,thisafternoonIfitdoesn’train,Iwillgohikingthisafternoon.it,besunny,she,flyakiteIfitissunny,shewillflyakite.he,havefreetime,gotoShanghai,Ifhehasfreetime,hewillgotoShanghai.she,studyhard,she,getgoodgradesIfshestudieshard,shewillgetgoodgrades.谢谢观看请指导