条件状语从句公开课PPT教学课件.pptx

大名三中青年教师优质课大赛,If引导的条件状语从句,1,Grammar,if从句,UNIT4,2,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、完成句子等题型中考查，分值约34分。,3,IfIgetupat7:00,Iwillbelate.,4,IfIamlate,theteacherwillbeangrywithme.,5,Iftheteacherisangrywithme,Iwillbesad.,6,If引导条件状语从句,一，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。,7,Ifyougetuplate,youwillbelateforschool.,Lookandsay,8,语法：,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：,9,_ifImill.,Iwillseeadoctor,Lookandsay,IfImlate,_.,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,10,例如：Wewillgototheparkifit_(rain)tomorrow.,Grammar,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。,doesnt,主将从现,rain,一般现在时,11,Itisgoingtoraintomorrow.,Iwillstayathome.,Ifit_tomorrow,I_athome.,rains,will,stay,12,Hewontstudyhard.,Hewillfailintheexam.,“Ifhe_studyhard.He_intheexam.”,doesnt,will,fail,13,IfIhavemuchmoney,Iwill,travelallovertheworld.,buylotsofdeliciousfood.,14,2.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”,15,Ifyoufeelhungry,youshouldeatsomething.,Ifyoufeeltired,youmusthavearest.,16,例如：DontwaitformeifI_(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,17,if引导的条件状语从句时态,主将从现,祈使句,情态动词,IwillsingasongifIamhappy.,主句,从句,Dontcrosstheroadifthelightisred,Youmuststopifthetrafficlightisred.,18,2.Ifit_(be)coldtomorrow,Iwillwearmysweater.,3.Hecangohomeifhe_(finish)hishomework.,finishes,1.Putupyourhandsifyou_(have)anyquestions.,have,is,趁热打铁,19,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：IllhelpyouwithyourEnglishifIamfreetomorrow.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。,20,四、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)Idontknowifthetrainhasarrived.,21,Ajoke,Amanlikedagirlverymuchandaskedifthegirlcouldmarryhim.Butthegirldidntagree.Shesaid,“ifthereisonlyonemanleft,Iwillmarryyou.”,22,Part1:If的用法,1.Iwanttoknowifhewillgotoaparkwithus.,2.Wewillhaveapicnicifitdoesntrain.,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,23,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。,doesntrain,willbe,是否,如果,24,Exercises:,Hewillhelpmewithmymathsifhe_free.AwasBwillbeCwouldbeDis2.Pleasetellhermytelephonenumberifshe_(want)toknow.,wants,D,D,25,3.Idontknowifmyuncle_.Ifhe_,Iwillbeveryhappy.Acomes;willcomeBwillcome;willcomeCcomes;comesDwillcome;comes,D,26,()4.Ifit_sunnytomorrow,I_boating.A.isgoB.willbe,goC.is,willgoD.willbe,willgo()5.-whatwillyoudoifit_tomorrow,-IllstayathomeandwatchTV.A.rainB.rainsC.willrainD.israining,C,B,27,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,summary,28,29,Competition,VS,30,ifwillshe,callme,I,tellheraboutit,Ifshecallsme,Iwilltellheraboutit.,31,he,come,nextweekend,I,tellyou,Ifhecomesnextweekend,Iwilltellyou.,32,notrain,gohiking,thisafternoon,Ifitdoesntrain,Iwillgohikingthisafternoon.,33,it,besunny,she,flyakite,Ifitiss