if条件状语从句

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,you’llbeverytiredinclassyourparentswillbesad.youwon’tgetgoodgrades.youreyeswillbepoorShewillbelate.Ifshe_____toschool,she________late.Sheisgoingtowalktoschool.walkswillbe1)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.I’llgowithyouifyoudon’twanttogoalone（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。Don’tgoandplayfootballifyoudon’tfinishyourhomework.PleasecallmeifhecomesnextSunday.if条件状语从句结构及时态RevisionIf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,hewon’tfinishhiswork.goes2.IfI________(become)adoctor,Icanhelpothers.become3.Ifwe_______(have)time,wewillgototheparktomorrow.have4.如果你去，我也去。Ifyougo,Iwillgo.5.如果明天下雨，请带雨衣。raincoatPleasetakearaincoatifitrains.Ifyouarefreethisweekend,whatwillyoudo?IfIamfree,…sleepwatchTVplaycomputergamespracticeIfyouwanttogetgoodmarks,dowhat?Don’tdowhat?•Ifyouwanttogetgoodmarks,__________.•Ifyouwanttogetgoodmarks,•don’t__________.studyhardlistentoteacherscarefully.dohomeworkbyyourself.copyyourhomework.talkintheclasscheatintheexamsIfyouhaveenoughpocketmoney,whatwillyoubuy?•IfIhaveenoughpocketmoney,•I____________________.IfyouinviteforeignerstoChina,wherewillyougo?•Iwillgoto_________,•ifIinviteforeignerstoChina.MountTaiWestlakeHainan•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,you’llpasstheexameasily.•=Workhard,andyou’llpasstheexameasily.•Ifyoudon’tworkhard,you’llfallbehindothers.•=Workhard,oryou’llfallbehindothers.（2）用介词with,without的替代形式：e.g.Ifthereisnowater,thefishmaydie.=Fishmaydiewithoutwater.Ifyouhelpme,I’llfinishmytaskontime.=Withyourhelp,I’llfinishmytaskontime.Activity1Rewritethesentenceswithif:Listeninclass,oryouwon’tunderstandwhattodo.Ifyoudon’tlisteninclass,youwon’tunderstandwhattodo.1)Eatbreakfast,oryou’llgethungryatschool.2)Hurryup!We’llbelate!Ifyoudon’teatbreakfast,you’llgethungryatschool.Ifyoudon’thurryup,we’llbelate.Activity2.Completethesentences—Iwanttogethighscores.—If__________________________(workhard/dowell)youworkhard,youwilldowell.1.-howcanIremembermyfriends’birthdays?-If_______________________________________(keepanoteinyourdiary/notforget).2.-It’slate,butIdon’twanttogotosleep.-If_______________________________________(notgetenoughsleep/feeltiredatschool).youkeepanoteinyourdiary,youwon’tforget.youdon’tgetenoughsleep,you’llfeeltiredatschool.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”I’llgotoseeyouifIamfreenextweek.Iwanttoknowifheisateacher.whether1.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=Ifitdoesn’train,Iwillgoouttomorrow.Iwillgoouttomorrowifitdoesn’train.Idon’tknowifthetrainhasarrived.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.doesn’trainwillbe2.Ifitdoesn’train,we’llgooutIf引导的宾语从句的时态由主句及本身时态决定；1.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Ican’tguessifshewillbeangry.4.Ifwehelpeachother,wewillgetgoodresults.1IfI_______________(notunderstand）,Iwillaskmyteacherforhelp.2IfI__________(copy)yourhomework,Iwillcheatmyself.3Ifshe_______________(notget)upearly,she’llmisstheearlybus.4Ifyourmother_______(buy)thebookforyou,itwillbegoodforyourstudy.don’tunderstandcopydoesn’tgetbuys5.Ifyou____________(notwork)hard,you_________(notpass)theexam.6.Ifyourbrother____________(break)thewindow,hewillfeelverysorryforthat.7.Ifthecomputer(notwork),menditplease.don’tworkwon’tpassbreaksdoesn’twork8.Ifshe_______(notbe)interestedinmath,shewillfinditveryboring.9.Ifyou_________(get)highscores,yourparentswillbeproudofyou.10.Ifyou_________(be)happy,wewillbehappy.isn’tgetare.Iwanttoknowifhe_______(come)tomorrow,ifhe_______(come),I__________(give)themessagetohim.comeswillcomewillgiveif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。Idon’tknowifyourfathercancometogether.Canyoutellmeifmissyourparents?1.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going2．I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asksCD3.–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit___.A.isn’trainB.rainC.won’trainD.doesn’train4.Whatwillyoudoifyou_____totheoldfolk’shomevisit?A.goB.wentC.goingD.willgoAD5.IfIeat____food,I’llbeveryfat.A.toomanyB.manytooC.toomuchD.muchtoo6.I’llgivethebooktohimifhe___herenextSunday.A.willcomeB.comesC.iscomingD.came7.There____anEnglishfilminourschooltomorrow.A.isgoingtohaveB.willhaveC.isgoingtobeD.has8.Couldyoutelluswhere____？A.willthenextOlympicGamesheldB.thenextOlympicGameswillbeheldC.wouldthenextOlympicGamesbeheldD.thenextOlympicGameswouldbeheld