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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(chē)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】
