if条件状语从句ppt课件

.,Revision,AdverbialClauseofConditionif引导的条件状语从句,-复习课,.,Ifyouarehappy,whatwillyoudo?,IfIamhappy,Iwillsmile.,.,Ifyoubecomesad,whatwillyoudo?,IfIbecomesad,Iwillcry.,.,Sheisdoingherhomework.,Ifyouarehard-working,youwillgetgoodgrades.,Shegetsgoodgrades.,.,Ifyouplaycomputergamesonweekdays,youllbeverytiredinclass,yourparentswillbesad.,youwontgetgoodgrades.,youreyeswillbepoor,.,Shewillbelate.,Ifshe_toschool,she_late.,Sheisgoingtowalktoschool.,walks,will,be,Lead-in,.,1)条件状语从句通常由if或unless(=ifnot)引导，从句中常用一般时代替将来时，即if或unless后的句子谓语用一般现在时。但是，主句则通常用将来时，情态动词或祈使句。,时态主将从现主句一般将来时，从句一般现在时,.,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.,if条件状语从句结构及时态,Revision,.,If引导条状语从句时，从句中用一般现在时代替一般将来时。,1.Ifhe_(go)tothemovies,hewontfinishhiswork.,goes,2.IfI_(become)adoctor,Icanhelpothers.,become,3.Ifwe_(have)time,wewillgototheparktomorrow.,have,4.如果你去，我也去。,Ifyougo,Iwillgo.,5.如果明天下雨，请带雨衣。raincoat,Pleasetakearaincoatifitrains.,excellent,.,Ifyouarefreethisweekend,whatwillyoudo?,IfIamfree,sleepwatchTVplaycomputergames,practice,.,Ifyouwanttogetgoodmarks,dowhat?Dontdowhat?,Ifyouwanttogetgoodmarks,_.Ifyouwanttogetgoodmarks,dont_.,studyhardlistentoteacherscarefully.dohomeworkbyyourself.,copyyourhomework.talkintheclasscheatintheexams,.,Ifyouhaveenoughpocketmoney,whatwillyoubuy?,IfIhaveenoughpocketmoney,I_.,.,IfyouinviteforeignerstoChina,wherewillyougo?,Iwillgoto_,ifIinviteforeignerstoChina.,MountTai,Westlake,Hainan,.,If条件句的替代形式：（1）祈使句+and/or+陈述句（谓语动词通常用将来时态）。其中，and表示句意顺承；or表示转折，意为“否则”。e.g.Ifyouworkhard,youllpasstheexameasily.=Workhard,andyoullpasstheexameasily.Ifyoudontworkhard,youllfallbehindothers.=Workhard,oryoullfallbehindothers.,verygood,.,（2）用介词with,without的替代形式：e.g.Ifthereisnowater,thefishmaydie.=Fishmaydiewithoutwater.Ifyouhelpme,Illfinishmytaskontime.=Withyourhelp,Illfinishmytaskontime.,.,Activity1Rewritethesentenceswithif:,Listeninclass,oryouwontunderstandwhattodo.,Ifyoudontlisteninclass,youwontunderstandwhattodo.,1)Eatbreakfast,oryoullgethungryatschool.2)Hurryup!Wellbelate!,Ifyoudonteatbreakfast,youllgethungryatschool.,Ifyoudonthurryup,wellbelate.,.,Activity2.Completethesentences,Iwanttogethighscores.If_(workhard/dowell),youworkhard,youwilldowell.,1.-howcanIremembermyfriendsbirthdays?-If_(keepanoteinyourdiary/notforget).2.-Itslate,butIdontwanttogotosleep.-If_(notgetenoughsleep/feeltiredatschool).,youkeepanoteinyourdiary,youwontforget.,youdontgetenoughsleep,youllfeeltiredatschool.,.,if引导的条件状语从句和if引导的宾语从句的区分:,If在宾语从句中翻译为“是否”If在条件状语从句中翻译为“如果”,IllgotoseeyouifIamfreenextweek.,Iwanttoknowifheisateacher.,whether,1.if在句中的含义不同,.,2.if在从句中的位置不同,If引导的宾语从句放在主句之后；而if引导的状语从句可放在主句之前也可放在主句之后,=Ifitdoesntrain,Iwillgoouttomorrow.,Iwillgoouttomorrowifitdoesntrain.,Idontknowifthetrainhasarrived.,If引导的条件状语从句放于句首时多用逗号隔开；而if引导的宾语从句则不能。,.,3.时态要求上有区别,If引导条件状语从句的时态为一般现在时记住“主将从现”,1.Iwanttoknowifthereasportsmeetingnextmonth.,doesntrain,willbe,2.Ifitdoesntrain,wellgoout,If引导的宾语从句的时态由主句及本身时态决定；,.,找出下列句子中哪些是if条件状语从句，哪些是if宾语从句,1.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Icantguessifshewillbeangry.4.Ifwehelpeachother,wewillgetgoodresults.,.,If引导的条件状语从句的练习,1IfI_(notunderstand）,Iwillaskmyteacherforhelp.IfI_(copy)yourhomework,Iwillcheatmyself.3Ifshe_(notget)upearly,shellmisstheearlybus.4Ifyourmother_(buy)thebookforyou,itwillbegoodforyourstudy.,dontunderstand,copy,doesntget,buys,.,5.Ifyou_(notwork)hard,you_(notpass)theexam.6.Ifyourbrother_(break)thewindow,hewillfeelverysorryforthat.7.Ifthecomputer(notwork),menditplease.,dontwork,wontpass,breaks,doesntwork,.,8.Ifshe_(notbe)interestedinmath,shewillfinditveryboring.9.Ifyou_(get)highscores,yourparentswillbeproudofyou.10.Ifyou_(be)happy,wewillbehappy.,isnt,get,are,.,.Iwanttoknowifhe_(come)tomorrow,ifhe_(come),I_(give)themessagetohim.,comes,willcome,willgive,.,summary,if的用法,2.引导条件状语从句：译为“如果，假如”(1)if从句+祈使句(2)if从句+主句（一般将来时）(3)if从句+主句（含有情态动词）,1.引导宾语从句：译为“是否”，表示不确定的概念。,Idontknowifyourfathercancometogether.Canyoutellmeifmissyourparents?,.,1.Ifyou_totheparty,youllhaveagreattime.A.willgoB.wentC.goD.going2I_hertheanswerifshe_me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks,C,D,3.Whatareyougoingtodotomorrow?-Wellgotothelibrarytomorrowifit_.A.isntrainB.rainC.wontrainD.doesntrain4.Whatwillyoudoifyou_totheoldfolkshomevisit?A.goB.wentC.goingD.willgo,A,D,.,5.IfIeat_food,Illbeveryfat.A.toomanyB.manytooC.toomuchD.muchtoo6.Illgivethebooktohimifhe_herenextSunday.A.willcomeB.comesC.iscomingD.came,7.There_anEnglishfilminourschooltomorrow.A.isgoingtohaveB.willhaveC.isgoingtobeD.has8.Couldyoutelluswhere_？A.willthenextOlympicGamesheldB.thenextOlympicGameswillbeheldC.wouldthenextOlympicGamesbeheldD.thenextOlympicGameswouldbeheld,C,C,B,B,.,If引导的非真实性条件状语从句（虚拟语气）(A)与现实事实相反主：过去将来时从：过去时Iftheywerehere,theywouldhelpyou.(B)与过去事实相反主：should/would+have+v.(p.p.)从：had+v.(p.p.)E.Ifhehadworkedharder,hewouldhavesucceeded.,.,BYTHETIME,bythetime+一般过去时，从句过去完成时bythetime+一般现在时，从句现在完成时,.,nerdn.令人厌烦的人；愚蠢的人；落伍的人；电脑迷,shrugv.耸肩（表示不知道或不在乎）shrugsthoff/aside不把当回事；对满不在乎；对不予理睬dirtn.泥土;污垢，污泥;下流想法;恶意中伤的话Hisclotheswerecoveredindirt.他的衣服沾满了污垢。,.,handn.手;协助，帮助;（工具等的）把，柄;掌管vt.传递，交给;搀扶;支持Severalofhis