Language,Ifsentences,If引導(dǎo)的條件狀語從句,1,Ifyoucoolwater,itturnsintoice.,ifclause從句,mainclause主句,Ifsentences,if引導(dǎo)的條件狀語從句,2,1.Ifyouheatmetal,itmelts.如果把金屬加熱，它就會(huì)融化。2.Waterturnsintoiceifyoucoolit.如果你冷卻水，它就會(huì)變成冰。,ifclause從句,mainclause主句,從句,主句,從句,主句,從句在主句前時(shí)，_（用/不用）逗號(hào)隔開當(dāng)主句在前時(shí)，則_（用/不用）逗號(hào),不用,用,3,Ifyoudropaglass,itbreaks.,Ifyouheatice,itmelts.,Ifyoustandintherain,yougetwet.,主句和從句都用_(時(shí)態(tài))因?yàn)閕f引導(dǎo)的條件句說的是_,一般現(xiàn)在時(shí),客觀事實(shí)/普遍現(xiàn)象,4,Actionswithdefiniteresults,讀下列例句，試著自己總結(jié)if的用法：1.Ifyouheatmetal,itmelts.如果把金屬加熱，它就會(huì)融化。2.Waterturnsintoiceifyoucoolit.如果你冷卻水，它就會(huì)變成冰。3.Ifyoustandintherain,yougetwet.如果你站在雨里，就會(huì)淋濕。4.Ifyoudropaglass,itbreaks.如果你把玻璃杯掉在地上，它就會(huì)碎。,5,由例句我們可以知道：如果if引導(dǎo)的條件句談?wù)摰氖且环N_時(shí)，主句謂語動(dòng)詞便不用shall/will+動(dòng)詞原形，而直接用_時(shí)的動(dòng)詞形式。,真理/客觀事實(shí),一般現(xiàn)在,6,ActionswithDefiniteResults,Water_(turn)intoiceifyou_(cool)it.Ifyou_(stand)intherain,you_(get)wet.,turns,cool,stand,get,7,-b-d-g-a-h-c-f-e,ExerciseA1,8,1.Ifyou_water.2.Aballoon_it.3.Ifyou_water.4.Metal_it.5.Wood_water.6.Aglass_it.,heatice,itturnsinto,burstsifyoustickapininto,coolsteam,itturnsinto,meltsifyouheat,floatsifyouputitinto,breaksifyoudrop,ExerciseA2,9,Actionswithpossibleresults,讀下列例句，總結(jié)if的用法：1.Ifheruns,hellgetthereintime.如果他跑步去，就會(huì)及時(shí)趕到那。2.Hewillhelpyouifyouaskhim.如果你請(qǐng)他幫忙，他會(huì)幫你的。3.Ifyoufailintheexam,youwilllethimdown.如果你考試失敗了，你會(huì)讓他失望的4.Ifyougetuplate,youwillbelateforschool.如果你起床晚了，上課就會(huì)遲到。,10,由例句我們可以知道：在if引導(dǎo)的條件狀語從句中，如果從句談?wù)摰氖且粋€(gè)有可能發(fā)生的事實(shí)以其產(chǎn)生的相關(guān)結(jié)果，從句用_,主句用_.,一般現(xiàn)在時(shí)態(tài),一般將來時(shí)態(tài),(主將從現(xiàn)),11,I_(stay)athomeifit_(rain)tomorrow.Ifhe_(notcome),I_(go)swimmingalone.,willstay,rains,doesntcome,willgo,ActionswithPossibleResults,12,Ifyougetuplate,youwillbelateforschool.,Lookandsay,getuplate,lateforschool,13,Ifthetelephonerings,Iwillanswerit.,Lookandsay,ring,answer,14,IfIhavealotofmoney,Iwillbuyabighouse.,Lookandsay,alotofmoney,abighouse,15,hard-working,Ifsheishard-working,shewillgetgoodgrades.,getgoodgrades,Lookandsay,16,gofishing.,IfitissunnythisSunday,Illgofishing.,Lookandsay,sunnythisSunday,17,P105B,WilliamhasfiveproblemsGivehimsomeadvicefromcolumnAandB1Isometimesforgettotaketherightbooktoschool.Ifyoucheckyourtimetableeverynight,youllknowwhichbookstotake.,18,一、判斷正誤，如果有誤，請(qǐng)更正1.Ifyouwilldomoreexercisethissummer,youwillbeveryfit.2.Thecandleburns,ifyoulightit.,willdodo,把逗號(hào)去掉,19,3.IwillbuildmanyschoolsforthepoorchildrenifIwinabilliondollars.4.Ifyoufreezewater,itwillturnintoice.5.Myunclevisitsthemuseumifhewillhavetime.,正確,willturnturns,visitswillvisit,willhavehas,20,If的兩個(gè)意思:,If:,“如果”“是否”,引導(dǎo)條件狀語從句,引導(dǎo)賓語從句,Idontknowifhewillcometomorrow.,Iwillgotothecinemaifitdoesntrain.,主現(xiàn)從現(xiàn)/主將從現(xiàn),if可用將來時(shí),21,BettywillvisittheHistoryMuseumifit_(rain)tomorrow.Benwantstoknowifit_(be)finetomorrow.,If引導(dǎo)的條件狀語從句不用將來時(shí)，意思為“如果”。If引導(dǎo)的賓語從句可以用將來時(shí)，意思為“是否”。,doesntrain,willbe,是否,如果,22,Exercises:,Hewillhelpmewithmymathsifhe_free.AwasBwillbeCwouldbeDisIdontknow_hewillcometomorrow._hecomes,Illtellyou.Aif;WhetherBwhether;WhetherCif;ThatDif;If3.Pleasetellhermytelephonenumberifshe_(want)toknow.,wants,D,D,23,4.Willyoucomeandstaywithusforawhileifyou_(finish)doingyourhomework?Wangdoesntknowifthere_(be)anEnglisheveningnextweek.Mikeaskedmeifwe_(ask)anyquestionsthenextclass.Wearegoingforpicnictomorrow.IllcallWendytomakesure_.AwhytostartBwhentostartCwhattostartDwhichtostart,wouldask,finish,willbe,B,24,8.-Wouldyoupleasetellme_next?-Thinkitover.Youllfindagoodway.AwhentodoBhowtodoCwhattodoDwheretodo9.Idontknowifmyuncle_.Ifhe_,Iwillbeveryhappy.Acomes;willcomeBwillcome;willcomeCcomes;comesDwillcome;comes10.EitheryouorI_goingtoShanghai.Onlyonepersonmaygothere.AareBwereCamDwas,C,D,C,25,()11.Ifit_sunnytomorrow,I_boating.A.isgoB.willbe,goC.is,willgoD.willbe,willgo()12.-whatwillyoudoifit_tomorrow,-IllstayathomeandwatchTV.A.rainB.rainsC.willrainD.israining,C,B,26,()13.Ifhe_,I_himthetime.A.comes,tellB.willcome,willtellC.comes,willtellD.willcome,tell()14.Ifit_,it_cold.A.snows,willbeB.snows,isC.willsnow,willbeD.willsnow,is()15.Ifyou_astoneintowater,it_.A.put,sinksB.put,willsinkC.willput,sinksD.willput,willsink,C,B,A,27,11.He_(help)mewithmymathsifhe_(be)free.12.IdontknowifJim_tomorrow.Ifhe_,Iwillbeveryglad.(come)13._(tell)hermytelephonenumberifshe_(want)toknow.14.Ifit_(be)sunnytomorrow,I_(go)boating.15.Ifyou_(boil)water,it_(turn)intosteam.16.Youcan_(travel)aroundtheworldifyou_(have)money.,willhelp,is,willcome,comes,Tell,wants,is,willgo,boil,turns,travel,have,28,Translatethefollowingsentences:1.如果你請(qǐng)他幫忙,他會(huì)幫你的。Ifyouaskhim,hewillhelpyou.2.如果你考試不及格,你會(huì)讓他失望的。Ifyoufailintheexam,youwilllethimdown.3.如果你作業(yè)做完了就可以回家了。Ifyouhavefinishedthehomework，youcangohome4.如果熊陷入危險(xiǎn)，它們就攻擊人。Ifbearsareindanger,theyattackpeople.5.如果我早早地到那里，我就可以快點(diǎn)看病。IfIgetthereearly，Icanseethedoctorquickly.,29,翻譯下面句子。1.如果明天不下雨的話，我就和同學(xué)們?nèi)?dòng)物園。2.如果周六你去購物的話，我就去。,Ifitdo