if条件状语从句_语法.ppt

,If从句条件状语从句,WhatwillIdoifitissunnythisweekend?,sleep,playcomputergames,goshopping,?,Part1:If的用法,1.Iwanttoknowifhewillgotoparkwithus.,2.Wewillhaveapicnicifitdoesntrain.,3.Ifyouboilwater,itbecomessteam.,4.Ifyoufeeltired,youmusthavearest.,宾语从句,条件状语从句,巧计、速记,语法1：if作为宾语从句的引导词，引导宾语从句。（是否）,语法2：if（如果）引导的条件状语从句,宾语从句,if用于宾语从句中,whether/if,改为陈述句语序,由从属连词whether,if引导的宾语从句,e.g.1.Iwanttoknow_.（他是否跟我们一起去公园）2.Askhim_.（他是否能来）3.Ididntknow_.（是否要下雨）,if(whether)hewillgototheparkwithus,whether(if)hecancome,whetheritwasgoingtorainornot,当句末为ornot时，引导词只能用whether而不能用if.,If与whether的区别,Idontknow_hewillcomeornot.Idontcareof_heishandsome.Hewondered_tostayherethenextweek._hewillcomeisnotdecided.,与ornot连用只能用whether,介词后只能用whether,与todo不定式连用只能用whether,作主语只能用whether,If引导条件状语从句,Completethesentenceswiththecorrectformofthewords.,1.Ifyou_(listen)tothemusic,_(buy)aCD.2.Ifhe_(be)lateforschool,_(notwait)forhim.3.Ifyou_(buy)anewcamera,_(get)agoodone.4.Ifthelight_(notcome)on,_(wait)foroneminute.,is,buy,get,doesntcome,wait,dontwait,listen,buy,Revision,Revision,祈使句+if条件状语从句if条件状语从句，+祈使句（从句后加逗号）,if条件状语从句要用一般现在时。,句型结构,时态,If条件状语从句（1）,Whatwillyoudoifyourehappy?,IfImhappy,Iwill_.IfImhappy,Iwill_.IfImhappy,Iwill_.IfImhappy,Iwill_.,clapmyhands,stampmyfeet,winkmyeyes,nodmyhead,IfImhungry,Iwill_.,IfImtired,Iwill_.,Lookandsay,eatsomefood,havearest,IfImill,_.,Iwillseeadoctor,Lookandsay,IfImlate,_.,Iwillsaysorry,Ifitrainstomorrow,I_.,willwatchTVathome,Ifit_tomorrow,_.,Illplaybasketball,doesntrain,Iwont_.,playbasketball,Ifitissunnythisweekend,whatwillyoudo?,Ifitissunnythisweekend,I_footballwithmyclassmates.,Ifitissunnythisweekend,I_.,willplay,Ifitissunnythisweekend,whatwontyoudo?,Ifitissunnythisweekend,I_.,Ifitissunnythisweekend,I_.,Wontstayathome,wontwatchtelevision,Ifyouarefreethisweekend,whatwillyoudo?,IfIamfree,sleepwatchTVplaycomputergames,practice,grammar,if条件状语从句(2),句子特点：1.if从句中用一般现在时，表示未来的一种条件，从句中可以加时间状语。2.当if表示未来的条件时，主句中用一般将来时。句型结构：主句+if条件状语从句if条件状语从句，+主句（从句后加逗号）,3.时态：if一般现在时，+主句一般将来时或（can/may/must+v.),If条件句：条件句用于陈述语气，表示假设的情况可能发生，其中if是“如果”的意思。,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.3.如果主句是祈使句，从句同样要用一般现在时。Dontgoandplayfootballifyoudontfinishyourhomework.PleasecallmeifhecomesnextSunday.,4.表示假设，表示将会发生和可能发生的事，或进行提醒警告。If+句子（一般现在时），+主句（主语will/may/can)+动词）Ifyoufinishyourhomework,youcangooutandplay.IfIhaveenoughmoneynextyear,Iwillgototravel.下列从句中的will不是将来时助动词，而是情态动词。翻译为“愿意”。Ifyouwillexcuseme,Ireallymustgotobed.如果你能原谅我的话，我真的要睡觉了。Ifyouwillwaitaminute,Illgoandtellmymotherthatyouarehere.如果你愿意等一会的话，我去告诉我妈妈你来了。,试比较下列句子：Ifyouseehimtomorrow,givehimthisbook.如果你明天去看他，给他这本书。Ifyouwillseehimtomorrow,givehimthisbook.如果你明天愿意去看他，给他这本书。,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,主句多用将来时；条件句表事实,主句常用现在时。if条件句有特点,现在时把将来替；这个规则要牢记!,if条件句歌诀,e.g.1.Ifyoudontgetupearly,youwillbelateforschool.你如果不早点起床，上学就会迟到。2.IfIplaygamesonit,itwillgowrong.如果我用它玩游戏，它就会坏掉。,3.Ifyoufinishthehomework，youcangohome如果你作业做完了就可以回家了。,4.Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想减肥，你必须少吃面包。,5.Ifyouheaticeitturnstowater.(也可用willturn)如果把冰加热，它就会化成水。,1.Ifhe_(not,doit),I_(do)it.,2.Ifyou_(be)lateforschool,myteacher_(be)angry.,are,willbe,3Ifshe_(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,6I_(stay)athome,Ifit_(rain).,7.Ifit_(not,rain),I_(go)out.,8.we_(play)football,Ifitis_(sun).,9.Ifshe_(become)astar,herparents_(not,send)heraway,10.He_(watch)TV,ifhe_(be)free.,willstay,rains,doesntrain,willgo,willplay,sunny,becomes,wontsend,willwatch,is,doesntdo,willdo,ExerciseTime,()5.Mikewantstoknowif_apicnictomorrow.Yes.Butifit_,wellvisitthemuseuminstead.A.youhave/willrainB.youwillhave/willrainC.youwillhave/rainsD.willyouhave/rains()6.Ireallydontknowifshe_itwhenshe_.A.finds/arrivesB.finds/willarriveC.willfind/willarriveD.willfind/arrives,（）4.Thevolleyballmatchwillbeputoff(推迟）ifit_.A.willrainB.rainsC.rainedD.israining,（）1.Becareful,ifyou_wanttomakemistakes.A.wontB.dontC.didntD.not（）2.Workhardifyou_togetagoodmark.A.wantedB.wantingC.wantD.willwant（）3.-Iwanttoknowifyou_tothepartytomorrow.-IwillifI_free.A.willcome;amB.come;amC.willcome;willbeD.come;willbe,exercises,B,C,A,B,C,D,-Imalwaystiredinthemorning.,-Ifyougotobedearly,youwontbetiredinthemorning.,Givingsuggestions:,-IgetthirstywhenIrun.,-Ifyoutakesomewaterwithyou,youwontgetthirstywhenyourun.,Iworrysomuchaboutmyschoolwork.,-Ifyoualwaysworkhard,youwontworryaboutyourschoolwork.,Youshouldworkhard!,Unit3activity1Rewritethesentenceswithif:,Listeninclass,oryouwontunderstandwhattodo.,Ifyoudontlisteninclass,youwontunderstandwhattodo.,1)Eatsomebreakfast,oryoullgethungryatschool.2)Hurryup!Wellbelate!3)Readtheinstructionscarefully.Thenyoullknowwhattodo.,Ifyoudonteatsomebreakfast,youllgethungryatschool.,Ifyoudonthurryup,wellbelate.,Ifyoureadtheinstructionscarefully,youllknowwhattodo.,Activity2.Completethesentences,Iwanttogethighscores.If_(workhard/dowell),youworkhard,youwilldowell.,1.-howcanIremembermyfriendsbirthdays?-If_(keepanoteinyourdiary/notforget).2.-Itslate,butIdontwanttogotosleep.-If_(notgetenoughsleep/feeltiredatschool).,youkeepanoteinyourdiary,youwontforget.,youdontgetenoughsleep,youllfeeltiredatschool.,3.-IdontlikespeakingEnglishoutsidetheclassroom.-If_(notpractice/notimprove).4.-ShouldItellmyteacherIdontunderstandthehomework?-If_(nottellher/shenotabletohelpyou).5.-IsitOKifIwatchTVforsixhours?-If_(youwatchtoomuch/eyeshurt).,youdontpractice,youwontimprove.,youdonttellher,shewontbeable