if條件狀語從句_課件好用.

1、If you cool water, it turns intoice.main clause主句If sentence%引導(dǎo)的條件狀語從句Ifsentencesifclause從句if clause從句main clause主句 1 If you heat metal, it melts.如果把金屬加熱，它就會(huì)融化.從句主句 2 Water turns into ice if you cool it.如果你撲卻水，它就會(huì)變成冰。主句從句在主句前時(shí)，（用/不用）逗號隔開 當(dāng)主句在前時(shí)，則不用（用/不用）逗號If you drop a glass, it breaks.If you heat i

2、ce, it melts.主句和從句都用 一般現(xiàn)在時(shí)（時(shí)態(tài)） 因?yàn)閕f引導(dǎo)的條件句說的瞽觀事實(shí)/普遍現(xiàn)象stand in the rain, you get wet如果if引導(dǎo)的條件句談?wù)摰氖且环N真理/客觀事實(shí)時(shí),主句謂語動(dòng)詞便不用shall/wilk動(dòng)詞原形，而直接用一一般現(xiàn)在時(shí)的動(dòng)詞形式。1 Water turns (turn) intoiceif youcool(cool)計(jì).$ If you stand(stand) in卞he rain,you get (get) wet.由例句我們可以知道:讀下列例句，總結(jié)的用法:1f he runs, he II get there in tim

3、e.如果他跑步去，就會(huì)及時(shí)趕到那。2.He will help you if you ask him.如果你請他幫忙，他會(huì)幫你的。3f you fail in the exam, you will let him down.如果你考試失敗了，你會(huì)讓他失望的4f you get up late, you will be late for school.如果你起床晚了，上課就會(huì)遲到。由例句我們可以知道：在if引導(dǎo)的條件狀語從句中,的是一個(gè)有可能發(fā)生的事實(shí)以其產(chǎn)牛的相 關(guān)結(jié)果，從句用一般現(xiàn)在時(shí)態(tài)，主句用 一般將來時(shí)態(tài)如果（主將從現(xiàn)）X I will stay (stay) at home if it

4、 rains (rain)tomorrow.1 If he doesn，t come (not come), I willQO(go)swimming alone.Look and sayIf you get up late,you will be late forschool.getup17 Look and sayIfthetelephonerings，Iwillanswerit.ring answera lotof17 If I have a lot of money, I will buy a big house.Look and sayget good gradesIf she is

5、 hard-working, she willget good grades.Look and saysunnhard-workinggo fishing If it is sunny this Sunday,VII go fishing 、判斷正誤，如果有誤，請更正1 If you will do more exercise this summer,you will be very fit.will do do2. The candle burns , if you light it.把逗號去掉3.丨will build many schools for the poorchildren i

6、f I win a billion dollars 正確4. If you freeze water, it will turn into ice.will turn turns5. My uncle visits the museum if he will havetime.visits will visitwill have has的兩個(gè)意思: If:“如果”引導(dǎo)條件狀語從句I will go to the cinema jf_it doesn?t rai主現(xiàn)從現(xiàn)/主將從現(xiàn)“是否”引導(dǎo)賓語從句Betty will visit the History Museum doesn train(r

7、ain) tomorrow.Ben wants to know if計(jì)will be (be) finetomorrow.I don t know if_he will come tornorroIf3if可用將來時(shí)if引導(dǎo)的條件狀語從句不用將來時(shí)，意思 為“如果oif引導(dǎo)的賓語從句可以用將來時(shí)，意思為“是否”。加二丿- f) )oai，cn|17 Exercises :1.He will help me with my maths訐heDfree.A was B will be C would be Dis2.I don，t know D he will cometomorrow._he c

8、omes, I，II tellZ you.A if?, Whether B whether; Whether C if; That D訐；If3.PleaseMlhfi%r my telephone number if she_ (want) to know4. Will you come and stay w汁h(huán) us for a whileif youfiriiah(finish) doing your homework?寫p. Wang doesn?t know if therewillbe (be) an English evening next week6.Mike asked me

9、 if wewould ask(ask) anyquestions the next class.7.We are qoinq for picnic to morrowIIIAwhy to start B when to startCwhat to start D which to start8. Would you please tell meQnex 1? Think itover. you II find a good way. A when to do B how todolCwhat to do b where to do9.1 don t know if my uncle D .

10、If he_I will be very happy.Acomes; will come B will come; will comeCcomes; comes b will come; comes10. Either you or I C going to Shanghai._ sunny tomorrow, I_B. will be, goD. will be, will go(g) 12. - what will you do if it_tomorrow,-111 stay at home and watch TV.A. rainB. rainsC. will rainD. is ra

11、ining(Q)11-lf it_boatingA. isgoC. is, will goOnlyone(O 13. If he_ , I_ him the time.A. comes, tell B. will come, will tellC. comes, will tell D. will come, tell(B) 14. If it_, it_ cold.A. snows, will be B. snows, isCwill snow, will be D. will snow, isA. put, sinksB. put, will sinkC. will put, sinks D. will put, will sink11. Hewi|J_heJp_ (help) me w汁h(huán) my maths if heis (be) free.12.1 dont know if Jim will come tomorrow. Wf he comes 1 will be very glad, (come)3. Tell(tell) her my telephone number if幺she wants (want)to kno