if条件状语从句-省公共课一等奖全国赛课获奖课件.pptx

If sentencesIf 引导条件状语从句引导条件状语从句第1页If you cool water,it turns into ice.if clause从句从句main clause主句主句第2页1.If you heat metal,it melts.假如把金属加热，它就会融化假如把金属加热，它就会融化。2.Water turns into ice if you cool it.假如你冷却水，它就会变成冰假如你冷却水，它就会变成冰。if clause从句从句main clause主句主句从句从句主句主句从句从句主句主句从句在主句前时，从句在主句前时，_ （用（用/不用）逗号隔开不用）逗号隔开当主句在前时，则当主句在前时，则_（用（用/不用）逗号不用）逗号不用用第3页If you drop a glass,it breaks.If you heat ice,it melts.If you stand in the rain,you get wet.主句和从句都用主句和从句都用_(时态时态)因为因为if引导条件句说是引导条件句说是_普通现在时普通现在时客观事实客观事实/普遍现象普遍现象第4页Actionswithdefiniteresults读以下例句，试着自己总结读以下例句，试着自己总结if 使用方法：使用方法：1.If you heat metal,it melts.假如把假如把金属加热金属加热，它就会融化，它就会融化。2.Water turns into ice if you cool it.假如你冷却水，它就会变成冰假如你冷却水，它就会变成冰。3.If you stand in the rain,you get wet.假如你站在雨里，就会淋湿。假如你站在雨里，就会淋湿。4.If you drop a glass,it breaks.假如你把玻璃杯掉在地上，它就会碎。假如你把玻璃杯掉在地上，它就会碎。第5页由例句我们能够知道：假如if引导条件句谈论是一个_时，主句谓语动词便不用shall/will+动词原形，而直接用_时动词形式。真理真理/客观事实客观事实普通现在普通现在第6页Water _(turn)into ice if you Water _(turn)into ice if you _(cool)it._(cool)it.If you _(stand)in the rain,If you _(stand)in the rain,you _(get)wet.you _(get)wet.turnscoolstandget第7页1.-b2.-d3.-g4.-a5.-h6.-c7.-f8.-e第8页1.If you _water.2.A balloon _ it.3.If you _water.4.Metal _it.5.Wood _water.6.A glass_ it.heat ice,it turns intobursts if you stick a pin into cool steam,it turns intomelts if you heatfloats if you put it intobreaks if you drop第9页Actionswithpossibleresults读以下例句，总结读以下例句，总结if 使用方法：使用方法：1.If he runs,hell get there in time.假如他跑步去，就会及时赶到那。假如他跑步去，就会及时赶到那。2.He will help you if you ask him.假如你请他帮忙，他会帮你。假如你请他帮忙，他会帮你。3.If you fail in the exam,you will let him down.假如你考试失败了，你会让他失望假如你考试失败了，你会让他失望4.If you get up late,you will be late for school.假如你起床晚了，上课就会迟到。假如你起床晚了，上课就会迟到。第10页由例句我们能够知道：在if引导条件状语从句中，假如从句谈论是一个有可能发生事实有可能发生事实以其产生相关结果，从句用_,主句用_.普通现在时态普通现在时态普通未来时态普通未来时态(主将从现主将从现)第11页I _(stay)at home if it _ I _(stay)at home if it _(rain)tomorrow.(rain)tomorrow.If he _(not come),I If he _(not come),I _(go)swimming alone.(go)swimming alone.will stayrainsdoesnt comewill go第12页If you get up late,you will be late for school.Look and sayget up latelate for school第13页If the telephone rings,I will answer it.Look and sayringanswer第14页If I have a lot of money,I will buy a big house.Look and saya lot of moneya big house第15页hard-workingIf she is hard-working,she will get good grades.get good gradesLook and say第16页go fishing.If it is sunny this Sunday,Ill go fishing.Look and saysunny this Sunday第17页P105BWilliamhasfiveproblemsGivehimsomeadvicefromcolumnAandB1Isometimesforgettotaketherightbooktoschool.Ifyoucheckyourtimetableeverynight,youllknowwhichbookstotake.第18页一、判断正误，假如有误，请更正一、判断正误，假如有误，请更正1.Ifyouwilldomoreexercisethissummer,youwillbeveryfit.2.Thecandleburns,ifyoulightit.will do do把逗号去掉把逗号去掉第19页3.IwillbuildmanyschoolsforthepoorchildrenifIwinabilliondollars.4.Ifyoufreezewater,itwillturnintoice.5.Myunclevisitsthemuseumifhewillhavetime.正确正确will turn turnsvisits will visit,will have has第20页If两个意思:If:“假如假如”“是否是否”引导条件状语从句引导条件状语从句引导宾语从句引导宾语从句Idontknowif hewillcometomorrow.Iwillgotothecinemaif itdoesntrain.主现从现主现从现/主将从现主将从现if可用未来时可用未来时第21页 Betty will visit the History Museum if it Betty will visit the History Museum if it _(rain)tomorrow._(rain)tomorrow.Ben wants to know if it_ Ben wants to know if it_(be)fine tomorrow.(be)fine tomorrow.If引导条件状语从句不用未来时，意思为“假如”。If引导宾语从句能够用未来时，意思为“是否”。doesnt rainwill be是否是否假假如如第22页Exercises:1.He will help me with my maths if he _ free.A was B will be C would be D is2.I dont know_ he will come tomorrow._ he comes,Ill tell you.A if;Whether B whether;Whether C if;That D if;If3.Please tell her my telephone number if she _(want)to know.wantsDD第23页4.Will you come and stay with us for a while if you _(finish)doing your homework?5.Wang doesnt know if there _(be)an English evening next week.6.Mike asked me if we _(ask)any questions the next class.7.We are going for picnic tomorrow.Ill call Wendy to make sure_.A why to start B when to start C what to start D which to startwould askfinishwill beB第24页8.-Would you please tell me_ next?-Think it over.Youll find a good way.A when to do B how to do C what to do D where to do9.I dont know if my uncle _.If he _,I will be very happy.A comes;will come B will come;will come C comes;comes D will come;comes10.Either you or I _ going to Shanghai.Only one person may go there.A are B were C am D was CDC第25页()11.Ifit_sunnytomorrow,I_boating.A.isgoB.willbe,goC.is,willgoD.willbe,willgo()12.-whatwillyoudoifit_tomorrow,-IllstayathomeandwatchTV.A.rainB.rainsC.willrainD.israiningCB 第26页()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,willsinkCB A 第27页11.He_(help)me with my maths if he 11.He_(help)me with my maths if he _(be)free._(be)free.12.I dont know if Jim _ tomorrow.12.I dont know if Jim _ tomorrow.If he _,I will be very glad.(come)If he _,I will be very glad.(come)13._(tell)her my telephone number if 13._(tell)her my telephone number if she _(want)to know.she _(want)to know.14.If it _(be)sunny tomorrow,I _ 14.If it _(be)sunny tomorrow,I _(go)boating.(go)boating.15.If you _(boil)water,it _ 15.If you _(boil)water,it _(turn)into steam.(turn)into steam.16.You can _(travel)around the 16.You can _(travel)around the world if you _(have)money.world if you _(have)money.will helpwill helpisiswill comewill comecomescomesTellTellwantswantsisiswill gowill goboilboilturnsturnstraveltravelhavehave第28页Translatethefollowingsentences:1.假如你请他帮忙,他会帮你。Ifyouaskhim,hewillhelpyou.2.假如你考试不及格,你会让他失望。Ifyoufailintheexam,youwilllethimdown.3.假如你作业做完了就能够回家了。Ifyouhavefinishedthehomework，youcangohome4.假如熊陷入危险，它们就攻击人。Ifbearsareindanger,theyattackpeople.5.假如我早早地到那里，我就能够快点看病。IfIgetthereearly，Icanseethedoctorquickly.第29页翻译下面句子。1.假如明天不下雨话，我就和同学们去动物园。2.假如周六你去购物话，我就去。If it doesnt rain tomorrow,I will go to the zoo with my classmates.I will go shopping on Saturday if you go.Test yourself第30页3.假如可能话，我就去火车站接你。4.假如你想减肥，就锻炼身体吧。If possible,Ill meet you at the railway station.Take some exercise if you want to be thinner/lose weight.Test yourself第31页