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1、If sentencesIf 引導(dǎo)的條件狀語(yǔ)從句引導(dǎo)的條件狀語(yǔ)從句1公開(kāi)課If you cool water,it turns into ice.if clause從句從句main clause主句主句2公開(kāi)課 1.If you heat metal,it melts.如果把金屬加熱，它就會(huì)融化如果把金屬加熱，它就會(huì)融化。2.Water turns into ice if you cool it.如果你冷卻水，它就會(huì)變成冰如果你冷卻水，它就會(huì)變成冰。if clause從句從句main clause主句主句從句從句主句主句從句從句主句主句從句在主句前時(shí)，從句在主句前時(shí)，_ （用（用/不用）逗號(hào)隔
2、開(kāi)不用）逗號(hào)隔開(kāi)當(dāng)主句在前時(shí)，則當(dāng)主句在前時(shí)，則_（用（用/不用）逗號(hào)不用）逗號(hào)不用用3公開(kāi)課If you drop a glass,it breaks.If you heat ice,it melts.If you stand in the rain,you get wet.主句和從句都用主句和從句都用_(時(shí)態(tài)時(shí)態(tài))因?yàn)橐驗(yàn)閕f引導(dǎo)的條件句說(shuō)的是引導(dǎo)的條件句說(shuō)的是_一般現(xiàn)在時(shí)一般現(xiàn)在時(shí)客觀事實(shí)客觀事實(shí)/普遍現(xiàn)象普遍現(xiàn)象4公開(kāi)課Actions with definite results 讀下列例句，試著自己總結(jié)讀下列例句，試著自己總結(jié)if if 的用法：的用法：1.If you heat me
3、tal,it melts.如果把如果把金屬加熱金屬加熱，它就會(huì)融化，它就會(huì)融化。2.Water turns into ice if you cool it.如果你冷卻水，它就會(huì)變成冰如果你冷卻水，它就會(huì)變成冰。3.If you stand in the rain,you get wet.如果你站在雨里，就會(huì)淋濕。如果你站在雨里，就會(huì)淋濕。4.If you drop a glass,it breaks.如果你把玻璃杯掉在地上，它就會(huì)碎。如果你把玻璃杯掉在地上，它就會(huì)碎。5公開(kāi)課 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(yǔ)動(dòng)詞便不用shall/will+動(dòng)詞原形，而直接用
4、_時(shí)的動(dòng)詞形式。真理真理/客觀事實(shí)客觀事實(shí)一般現(xiàn)在一般現(xiàn)在6公開(kāi)課Water _(turn)into ice if you _(cool)it.If you _(stand)in the rain,you _(get)wet.turnscoolstandget7公開(kāi)課1.-b2.-d3.-g4.-a5.-h6.-c7.-f8.-e8公開(kāi)課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
5、 a pin into cool steam,it turns intomelts if you heatfloats if you put it intobreaks if you drop9公開(kāi)課Actions with possible results 讀下列例句，總結(jié)讀下列例句，總結(jié)if if 的用法：的用法：1.If he runs,hell get there in time.如果他跑步去，就會(huì)及時(shí)趕到那。如果他跑步去，就會(huì)及時(shí)趕到那。2.He will help you if you ask him.如果你請(qǐng)他幫忙，他會(huì)幫你的。如果你請(qǐng)他幫忙，他會(huì)幫你的。3.If you fai
6、l in the exam,you will let him down.如果你考試失敗了，你會(huì)讓他失望的如果你考試失敗了，你會(huì)讓他失望的 4.If you get up late,you will be late for school.如果你起床晚了，上課就會(huì)遲到。如果你起床晚了，上課就會(huì)遲到。10公開(kāi)課 由例句我們可以知道：在if 引導(dǎo)的條件狀語(yǔ)從句中，如果從句談?wù)摰氖且粋€(gè)有可能發(fā)生的事實(shí)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)一般現(xiàn)在時(shí)態(tài)一般將來(lái)時(shí)態(tài)一般將來(lái)時(shí)態(tài)(主將從現(xiàn)主將從現(xiàn))11公開(kāi)課I _(stay)at home if it _(rain)tomorr
7、ow.If he _(not come),I _(go)swimming alone.will stayrainsdoesnt comewill go12公開(kāi)課If you get up late,you will be late for school.get up latelate for school13公開(kāi)課If the telephone rings,I will answer it.ringanswer14公開(kāi)課If I have a lot of money,I will buy a big house.a lot of moneya big house15公開(kāi)課hard-work
8、ingIf she is hard-working,she will get good grades.get good grades16公開(kāi)課go fishing.If it is sunny this Sunday,Ill go fishing.sunny this Sunday17公開(kāi)課P105 B William has five problems Give him some advice from column A and B 1 I sometimes forget to take the right book to school.If you check your timetabl
9、e every night,youll know which books to take.18公開(kāi)課一、判斷正誤，如果有誤，請(qǐng)更正一、判斷正誤，如果有誤，請(qǐng)更正1.If you will do more exercise this summer,you will be very fit.2.The candle burns,if you light it.will do do把逗號(hào)去掉把逗號(hào)去掉19公開(kāi)課3.I will build many schools for the poor children if I win a billion dollars.4.If you freeze wat
10、er,it will turn into ice.5.My uncle visits the museum if he will have time.正確正確will turn turnsvisits will visit,will have has20公開(kāi)課If 的兩個(gè)意思:If:“如果如果”“是否是否”引導(dǎo)條件狀語(yǔ)從句引導(dǎo)條件狀語(yǔ)從句引導(dǎo)賓語(yǔ)從句引導(dǎo)賓語(yǔ)從句I dont know if he will come tomorrow.I will go to the cinema if it doesnt rain.主現(xiàn)從現(xiàn)主現(xiàn)從現(xiàn)/主將從現(xiàn)主將從現(xiàn)if可用將來(lái)時(shí)可用將來(lái)時(shí)21公開(kāi)課Betty
11、 will visit the History Museum if it _(rain)tomorrow.Ben wants to know if it_(be)fine tomorrow.If 引導(dǎo)的條件狀語(yǔ)從句不用將來(lái)時(shí)，意思為“如果”。If 引導(dǎo)的賓語(yǔ)從句可以用將來(lái)時(shí)，意思為“是否”。doesnt rainwill be22公開(kāi)課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 com
12、es,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.wantsDD23公開(kāi)課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
13、 _(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 beB24公開(kāi)課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
14、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 CDC25公開(kāi)課()11.If it _ sunny tomorrow,I _ boating.A.is go B.will be,g
15、o C.is,will go D.will be,will go()12.-what will you do if it _ tomorrow,-Ill stay at home and watch TV.A.rain B.rains C.will rain D.is raining CB 26公開(kāi)課()13.If he _,I _ him the time.A.comes,tell B.will come,will tellC.comes,will tell D.will come,tell()14.If it _,it _cold.A.snows,will be B.snows,isC.w
16、ill snow,will be D.will snow,is()1 5.If you _a stone into water,it _.A.put,sinks B.put,will sinkC.will put,sinks D.will put,will sinkCB A 27公開(kāi)課11.He_(help)me with my maths if he _(be)free.12.I dont know if Jim _ tomorrow.If he _,I will be very glad.(come)13._(tell)her my telephone number if she _(wa
17、nt)to know.14.If it _(be)sunny tomorrow,I _(go)boating.15.If you _(boil)water,it _(turn)into steam.16.You can _(travel)around the world if you _(have)money.will helpiswill comecomesTellwantsiswill goboilturnstravelhave28公開(kāi)課Translate the following sentences:1.如果你請(qǐng)他幫忙,他會(huì)幫你的。If you ask him,he will help
18、 you.2.如果你考試不及格,你會(huì)讓他失望的。If you fail in the exam,you will let him down.3.如果你作業(yè)做完了就可以回家了。If you have finished the homework，you can go home4.如果熊陷入危險(xiǎn)，它們就攻擊人。If bears are in danger,they attack people.5.如果我早早地到那里，我就可以快點(diǎn)看病。If I get there early，I can see the doctor quickly.29公開(kāi)課 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(gòu)物的話，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.30公開(kāi)課3.如果可能的話，我就去火車站接你。4.如果你想減肥，就鍛煉身體吧。If possible,Ill meet you at the railway station.Take some exercise if you want to be thinner/lose weight.31公開(kāi)課
if條件狀語(yǔ)從句-課件【上課材料】
