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IfsentencesIf引导的条件状语从句byGraceIfyoucoolwater,itturnsintoice.①②ifclause从句mainclause主句•1.Ifyouheatmetal,itmelts.•如果把金属加热，它就会融化。•2.Waterturnsintoiceifyoucoolit.•如果你冷却水，它就会变成冰。ifclause从句mainclause主句从句主句从句主句从句在主句前时，____（用/不用）逗号隔开当主句在前时，则____（用/不用）逗号不用用Ifyoudropaglass,itbreaks.Ifyouheatice,itmelts.Ifyoustandintherain,yougetwet.主句和从句都用_____________(时态)因为if引导的条件句说的是_____________一般现在时客观事实/普遍现象•由例句我们可以知道：•如果if引导的条件句谈论的是一种____________时，主句谓语动词便不用shall/will+动词原形，而直接用_______时的动词形式。真理/客观事实一般现在Water________(turn)intoiceifyou__________(cool)it.Ifyou________(stand)intherain,you_________(get)wet.turnscoolstandget•读下列例句，总结if的用法：•1.Ifheruns,he’llgetthereintime.•如果他跑步去，就会及时赶到那。•2.Hewillhelpyouifyouaskhim.•如果你请他帮忙，他会帮你的。•3.Ifyoufailintheexam,youwilllethimdown.•如果你考试失败了，你会让他失望的•4.Ifyougetuplate,youwillbelateforschool.•如果你起床晚了，上课就会迟到。•由例句我们可以知道：•在if引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实以其产生的相关结果，从句用_____________,主句用_______________.一般现在时态一般将来时态(主将从现)I________(stay)athomeifit_______(rain)tomorrow.Ifhe____________(notcome),I_____________(go)swimmingalone.willstayrainsdoesn’tcomewillgoIfyougetuplate,youwillbelateforschool.LookandsaygetuplatelateforschoolIfthetelephonerings,Iwillanswerit.LookandsayringanswerIfIhavealotofmoney,Iwillbuyabighouse.Lookandsayalotofmoneyabighousehard-workingIfsheishard-working,shewillgetgoodgrades.getgoodgradesLookandsaygofishing.IfitissunnythisSunday,I’llgofishing.LookandsaysunnythisSunday一、判断正误，如果有误，请更正1.Ifyouwilldomoreexercisethissummer,youwillbeveryfit.2.Thecandleburns,ifyoulightit.willdo→do把逗号去掉3.IwillbuildmanyschoolsforthepoorchildrenifIwinabilliondollars.4.Ifyoufreezewater,itwillturnintoice.5.Myunclevisitsthemuseumifhewillhavetime.正确willturn→turnsvisits→willvisit,willhave→hasIf的两个意思:•If:“如果”“是否”引导条件状语从句引导宾语从句Idon’tknowifhewillcometomorrow.Iwillgotothecinemaifitdoesn’train.主现从现/主将从现if可用将来时•BettywillvisittheHistoryMuseumifit____________(rain)tomorrow.•Benwantstoknowifit___________(be)finetomorrow.If引导的条件状语从句不用将来时，意思为“如果”。If引导的宾语从句可以用将来时，意思为“是否”。doesn’trainwillbe是否如果Exercises:1.Hewillhelpmewithmymathsifhe____free.AwasBwillbeCwouldbeDis2.Idon’tknow_____hewillcometomorrow.____hecomes,I’lltellyou.Aif;WhetherBwhether;WhetherCif;ThatDif;If3.Pleasetellhermytelephonenumberifshe_____(want)toknow.wantsDD4.Willyoucomeandstaywithusforawhileifyou______(finish)doingyourhomework?5.Wangdoesn’tknowifthere_________(be)anEnglisheveningnextweek.6.Mikeaskedmeifwe___________(ask)anyquestionsthenextclass.7.Wearegoingforpicnictomorrow.I’llcallWendytomakesure________.AwhytostartBwhentostartCwhattostartDwhichtostartwouldaskfinishwillbeB8.---Wouldyoupleasetellme____next?---Thinkitover.You’llfindagoodway.AwhentodoBhowtodoCwhattodoDwheretodo9.Idon’tknowifmyuncle_____.Ifhe___,Iwillbeveryhappy.Acomes;willcomeBwillcome;willcomeCcomes;comesDwillcome;comes10.EitheryouorI_____goingtoShanghai.Onlyonepersonmaygothere.AareBwereCamDwasCDC()11.Ifit______sunnytomorrow,I____boating.A.isgoB.willbe,goC.is,willgoD.willbe,willgo()12.--whatwillyoudoifit______tomorrow,--I’llstayathomeandwatchTV.A.rainB.rainsC.willrainD.israiningCB()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,willsinkCBA11.He_______(help)mewithmymathsifhe____(be)free.12.Idon’tknowifJim________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.willhelpiswillcomecomesTellwantsiswillgoboilturnstravelhave