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IfIgetuplate,Iwillbelateforschool.IfIdon’tfinishmyhomework,Iwon’tgotobed.由if引导的从句叫条件状语从句，if意为“如果” 若主句是一般将来时，从句要用一般现在时。Ifyoujointheband,youwillbefamous.=Youwillbefamousifyoujointheband.Grammar条件状语从句 Ifthetelephonerings,Iwillanswerit.Ifyougetuplate,youwillbelateforschool.Lookandsay Ifyoufeelhungry,youshouldeatsomething.Ifyoufeeltired,youmusthavearest. Ifyouareill,youmustgotoseeadoctor.Ifyouareridingabikeinthestreet,youmustbeverycareful. PairworkIfyoustayathome,youwillbesorry. Ifyouworkuntilnight,youwillbetired. Ifwebreakthetrafficrules,wewillgetafineandevenbeindanger. Ifitisfinetomorrow,wewillgoonaschooltrip.wewillclimbmountains. IwillgotoBeijingUniversity.IfIstudyhard, IfIhaveenoughmoney,Iwilltravelaroundtheworld. Ifyouhavearobot,whatwillyoudo?playgamescleanmybedroomdohomeworkformeIwillletit…Example:IfIhavearobot, Ifsentences(1)Ifsbdoessth,sbwilldosth=sbwilldosthifsbdoessth主句（将来时）从句（一般现在时）A：actionshavingresultsthatwillprobablyhappen(2)主句为祈使句或情态动词形式Ifsbdoessth,pleasedosthIfsbdoessth,sbmay(情态动词)dosth IfsentencesIfsbdoessth,sb/sthdoessth=sb/sthdosthifsbdoessth主句（一般现在时）从句（一般现在时）B：actionshavingresultsthatwillcertainlyhappen相当于when从句Can‘if’bereplacedbyotherwords?主语的行为将导致某种必然发生的结果时 Exercises:changethefollowingsentencesintoifsentences3.Getupearly,notbelate4.Takeafishoutofwater,die5.Heatmetal,meltIfyougetupearly,youwon’tbelate.Ifyouheatmetal,itmeltsreturnscallbuypasses1.Ifshe______(return)fromParis,please____(call)me.2.Ifhe______(pass)thetest，wemay____(buy)acar.Ifyoutakeafishoutofwater,itdies. 条件状语丛句只有if…sentenses一种吗？C：Unless：sbwilldosthunlesssbdoessthifsbdoesnotdosthEg:Youwillbelateforschoolyounow.Youwillbelateforschoolyounow.unlessleavedon’tleaveif Unlesssentencesexerciseshavetoothache,cleanyourteethregularlygetveryhot,puttheair-conditioneronsoonUnlessyoucleanyourteethregularly,youwillhavetoothacheIfyoudon’tcleanyourteethregularly,youwillhavetoothacheUnlessyouputtheair-conditioneronsoon,youwillgetveryhot.Ifyoudon’tputtheair-conditioneronsoon,youwillgetveryhot. Morepractice1.Ifyou______(drop)aglass,it______(break).2.He______(fail)intheexamifhe______(notstudy)hard.3.Unlessyou______(leave)now,you______(be)late.4.We______(have)abarbecueunlessit______(rain).5.Ifyou____(cool)water,it_____(turn)intoice.6.Hurryup,oryouwillmissthebus.___youdon’thurryup,you____catchtheearlybus.7.Studyhard,oryou’llmissfallbehind.______youstudyhard,you______fallbehind.8.Ifyoudon’tputonyourscarf,you’llcatchcold.Putonyourscarf,_____you’llcatchcold.9.Theinsurancecompanywouldpayhim2millionyuanifthevasewasstolen.Theinsurancecompany_____payhim2millionyuan_____thevasewasstolen.10.Idon’tknowifit_______tomorrow.Ifit____,Iwon’tgoshopping.(rain)dropbreakswillfaildoesn’tstudyleavewillbewillhaverainscoolturnsIfwon’tUnlesswillorwon’tunlesswillrainrains Haveatry用括号内所给词的正确形式填空1.I’msureifhe_____(go)totheparty,he________(have)agreattime.2.Iftherain_______(stop)tonight,wewillgotothecinema.3.I’llbuyacomputerifI______(have)enoughmoney.4.You_________(notget)nervousifyou_____(do)enoughexercise.5.Ifshe____(be)kindtome,I__________(notargue)withher.6.Iwanttoknowifhe_________(come)tomorrow,ifhe_______(come),I__________(give)themassagetohim.7.Ifyou_____(pay)moreattentiontothat,he_________(notget)injured.goeswillhavestopshavewon’tgetdoiswon’targuecomescomeswillgivepaywon’tget 8.MrLiwillbemadifwe_______(break)therules.9.Ifit_____(be)cloudy,they_______(notgo)therebyair.10.Pleaseletusknowifhe________(arrive)tomorrow.Pleaseletusknowifhe_________(arrive)tomorrow.11.ShallIsay“Hello”whentheforeigner______(come)intotheclassroom?12.He’llgetbettergradesifhe_________(study)hard.13.Ifyouworkreallyhard,you_______(be)famousandrich.breakiswon’tgowillarrivearrives请告诉我们他明天是否会来。如果他明天来的话请告诉我们。comesstudieswillbe14.Idon’tknowifit_______tomorrow.Ifit____,Iwon’tgoshopping.(rain)willrainrains表是否，用将来时态表如果，用一般现在时态 Seeyou!
