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IfIgetupat7:00,Iwillbelate.IfIamlate,theteacherwillbeangrywithme.Iftheteacherisangrywithme,Iwillbesad.Ifyougetuplate,youwillbelateforschool.①②if从句主句由if引导的从句叫条件状语从句，if意思为“如果”。例如：Wewillgototheparkifit_____________(rain)tomorrow.含if条件状语从句的主从复合句1.if条件状语从句中，主句用一般将来时，if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.rainswillstayIfit____sunnytomorrow,they___________atrip.Itwillbesunnytomorrow.Theywillhaveatriptomorrow.iswillhaveHewon’tstudyhard.Hewillfailintheexam.“Ifhe_____studyhard.He_______intheexam.”doesn’twillfailShewillbelate.Ifshe_____toschool,she________late.Sheisgoingtowalktoschool.walkswillbeIfIhavemuchmoney,Iwillbuyabighouse.travelallovertheworld.buylotsofdeliciousfood.IfIhavealotofmoney,Iwillbuyacar.IfIbuyacar,Iwilltraveleverywhere.IfItraveleverywhere,Iwillbehappy.IfIamhappy,Iwillbehealthy.•Shemustseeadentistifshehasatoothache.•Youcangoshoppingwithyoursisterifyouhavetimethisafternoon.2.if条件状语从句中，主句可以是must，can，may等情态动词，if从句用___________。例如：Youmuststopifthetrafficlight____(be)red.is一般现在时“主情从现”Ifyoufeelhungry,youshouldeatsomething.Ifyoufeeltired,youmusthavearest.Ifyouareill,youmustgotoseeadoctor.Ifyouareridingabike,youmustbecareful.•CallmeifTinacomes.•Haveagoodrestifyouaretired.例如：Don’twaitformeifI_____(be)late.3.if条件状语从句中，主句可以是祈使句，从句用____________表示将来。_________原则。am主祈从现一般现在时2.Ifit____(be)coldtomorrow,Iwillwearmysweater.3.Hecangohomeifhe________(finish)hishomework.finishes1.Putupyourhandsifyou_____(have)anyquestions.haveis*Ifyouarehappy,whatwillyoudo?IfIamhappy,Iwillsmile/sing.*Ifyoubecomesad,whatwillyoudo?IfIbecomesad,Iwillcry.*Whatwillhappenifyoudotoomuchwork?IfIdotoomuchwork,Iwillgettired.ifwillshe,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.()1.Ifit______sunnytomorrow,I____boating.A.isgoB.willbe,goC.is,willgoD.willbe,willgo()2.--whatwillyoudoifit______tomorrow,--I’llstayathomeandwatchTV.A.rainB.rainsC.willrainD.israiningCB()3.Ifhe______,I______himthetime.A.comes,tellB.willcome,willtellC.comes,willtellD.willcome,tell()4.Ifit______,it______cold.A.snows,willbeB.snows,isC.willsnow,willbeD.willsnow,is()5.Ifyou___astoneintowater,it____.A.put,sinksB.put,willsinkC.willput,sinksD.willput,willsinkCBATranslatethefollowingsentences:1.如果你请他帮忙,他会帮你的。Ifyouaskhim,hewillhelpyou.2.如果你考试不及格,你会让他失望的。Ifyoufailintheexam,youwilllethimdown.3.如果你作业做完了,就可以回家了。Ifyouhavefinishedthehomework，youcangohome．4.如果周六你去购物，我就去。IfyougoshoppingonSaturday,Iwillgo.5.如果我早早地到那里，我就可以快点看病。IfIgetthereearly，Icanseethedoctorquickly.