if条件状语从句 好用

.,Language,Ifsentences,If引导的条件状语从句,.,Ifyoucoolwater,itturnsintoice.,ifclause从句,mainclause主句,Ifsentences,if引导的条件状语从句,.,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,.,Actionswithdefiniteresults,读下列例句，试着自己总结if的用法：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。3.Ifyoustandintherain,yougetwet.如果你站在雨里，就会淋湿。4.Ifyoudropaglass,itbreaks.如果你把玻璃杯掉在地上，它就会碎。,.,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,.,ActionswithDefiniteResults,Water_(turn)intoiceifyou_(cool)it.Ifyou_(stand)intherain,you_(get)wet.,turns,cool,stand,get,.,-b-d-g-a-h-c-f-e,ExerciseA1,.,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,.,Actionswithpossibleresults,读下列例句，总结if的用法：1.Ifheruns,hellgetthereintime.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.,willstay,rains,doesntcome,willgo,ActionswithPossibleResults,.,Ifyougetuplate,youwillbelateforschool.,Lookandsay,getuplate,lateforschool,.,Ifthetelephonerings,Iwillanswerit.,Lookandsay,ring,answer,.,IfIhavealotofmoney,Iwillbuyabighouse.,Lookandsay,alotofmoney,abighouse,.,hard-working,Ifsheishard-working,shewillgetgoodgrades.,getgoodgrades,Lookandsay,.,gofishing.,IfitissunnythisSunday,Illgofishing.,Lookandsay,sunnythisSunday,.,P105B,WilliamhasfiveproblemsGivehimsomeadvicefromcolumnAandB1Isometimesforgettotaketherightbooktoschool.Ifyoucheckyourtimetableeverynight,youllknowwhichbookstotake.,.,一、判断正误，如果有误，请更正1.Ifyouwilldomoreexercisethissummer,youwillbeveryfit.2.Thecandleburns,ifyoulightit.,willdodo,把逗号去掉,.,3.IwillbuildmanyschoolsforthepoorchildrenifIwinabilliondollars.4.Ifyoufreezewater,itwillturnintoice.5.Myunclevisitsthemuseumifhewillhavetime.,正确,willturnturns,visitswillvisit,willhavehas,.,If的两个意思:,If:,“如果”“是否”,引导条件状语从句,引导宾语从句,Idontknowifhewillcometomorrow.,Iwillgotothecinemaifitdoesntrain.,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”。,doesntrain,willbe,是否,如果,.,Exercises:,Hewillhelpmewithmymathsifhe_free.AwasBwillbeCwouldbeDisIdontknow_hewillcometomorrow._hecomes,Illtellyou.Aif;WhetherBwhether;WhetherCif;ThatDif;If3.Pleasetellhermytelephonenumberifshe_(want)toknow.,wants,D,D,.,4.Willyoucomeandstaywithusforawhileifyou_(finish)doingyourhomework?Wangdoesntknowifthere_(be)anEnglisheveningnextweek.Mikeaskedmeifwe_(ask)anyquestionsthenextclass.Wearegoingforpicnictomorrow.IllcallWendytomakesure_.AwhytostartBwhentostartCwhattostartDwhichtostart,wouldask,finish,willbe,B,.,8.-Wouldyoupleasetellme_next?-Thinkitover.Youllfindagoodway.AwhentodoBhowtodoCwhattodoDwheretodo9.Idontknowifmyuncle_.Ifhe_,Iwillbeveryhappy.Acomes;willcomeBwillcome;willcomeCcomes;comesDwillcome;comes10.EitheryouorI_goingtoShanghai.Onlyonepersonmaygothere.AareBwereCamDwas,C,D,C,.,()11.Ifit_sunnytomorrow,I_boating.A.isgoB.willbe,goC.is,willgoD.willbe,willgo()12.-whatwillyoudoifit_tomorrow,-IllstayathomeandwatchTV.A.rainB.rainsC.willrainD.israining,C,B,.,()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,.,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,.,Translatethefollowingsentences: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，youcangohome4.如果熊陷入危险，它们就攻击人。Ifbearsareindanger,theyattackpeople.5.如果我早早地到那里，我就可以快点看病。IfIgetthereearly，Icanseethedoctorquickly.,.,翻译下面句子。1.如果明天不下雨的话，我就和同学们去动物园。2.如果周六你去购物的话，我就去。,Ifi