if条件状语从句课件好用

IfsentencesIf you cool water, it turns into ice.if clause 从句main clause主句If sentence%引导的条件状语从句if clause从句main clause主句 1 If you heat metal, it melts.如果把金属加热，它就会融化. 从句主句 2Water turns into ice if you cool it.如果你扑却水，它就会变成冰。主句从句在主句前时，（用/不用）逗号隔开 当主句在前时，则不用（用/不用）逗号If you drop a glass, it breaks.If you heat ice, it melts.主句和从句都用 一般现在时（时态） 因为if引导的条件句说的瞽观事实/普遍现象stand in the rain, you get wet由例句我们可以知道:如果if引导的条件句谈论的是一种真理/客观事实时,主句谓语动词便不用shall/wilk动词原形，而直接用一一般现在时的动词形式。1 Water turns (turn) into ice if you cool (cool)计.$ If you stand(stand) in 卞he rain,you get (get) wet.读下列例句，总结的用法:1f he runs, he II get there in time. 如果他跑步去，就会及时赶到那。2. He will help you if you ask him.如果你请他帮忙，他会帮你的。3f you fail in the exam, you will let him down. 如果你考试失败了，你会让他失望的如果从句谈论4f you get up late, you will be late for school. 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,的是一个有可能发生的事实以其产牛的相 关结果，从句用一般现在时态，主句用 一般将来时态（主将从现）get up late late for schoolX I will stay (stay) at home if it rains (rain) tomorrow.1 If he doesn，t come (not come), I will qo(go) swimming alone.Look and sayIf you get up late, you will be late for school.Look and sayring answerIf the telephone rings， I will answer it.a lot of moneya big house17 If I have a lot of money, I will buy a big house.hard-workinggo fishing sunny this SundayLook and sayget good gradesIf she is hard-working, she will get good grades.Look and sayIf it is sunny this Sunday, V II go fishing 、判断正误，如果有误，请更正1 If you will do more exercise this summer, you will be very fit.will do do2. The candle burns , if you light it.把逗号去掉3. 丨 will build many schools for the poor children if I win a billion dollars正确4. If you freeze water, it will turn into ice.will turn turns5. My uncle visits the museum if he will havetime.visits will visit will have has的两个意思: If: “如果”引导条件状语从句I will go to the cinema jf_it doesn? t rai主现从现/主将从现“是否”引导宾语从句I don t know if_he will come tornorroif可用将来时If 3if引导的条件状语从句不用将来时，意思 为“如果oif引导的宾语从句可以用将来时，意思为“是否”。加Betty will visit the History Museum doesn train (rain) tomorrow.Ben wants to know if 计 will be (be) fine tomorrow.二 丿 f)oai，cn|Exercises :1. He will help me with my maths 讦 heD free.A was B will be C would be Dis2. I don， t know D he will cometomorrow.he comes, I， II tellZ you.A if?, Whether B whether; Whether C if; That D 讦；If3. PleaseMlhfi%r my telephone number if she(want) to know4. Will you come and stay w汁h us for a whileif you firiiah (finish) doing your homework?寫p. Wang doesn? t know if therewill be (be) an English evening next week6. Mike asked me if we would ask (ask) any questions the next class.7. We are qoinq for picnic to morrow I IIA why to start B when to startC what to start D which to start8. Would you please tell me Q nex 1? Think it over. you II find a good way. A when to do B how to dol C what to do b where to do9.1 don t know if my uncle D . If heI will be very happy.A comes; will come B will come; will comeC comes; comes b will come; comes10. Either you or I C going to Shanghai.Only one person may go there. A are B were C am D was(Q)11-lf it_ boating A. is goC. is, will go_ sunny tomorrow, IB. will be, goD. will be, will go(g) 12. - what will you do if ittomorrow,-111 stay at home and watch TV. A. rainB. rainsC. will rainD. is raining(O 13. If he, Ihim the time.A. comes, tell B. will come, will tellC. comes, will tell D. will come, tell(B) 14. If it, itcold.A. snows, will be B. snows, is(A)1 5. If youa stone into water, itC will 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 my maths if he is (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 know14. Tf 汁 is (be) sunny tomorrow, I will go (go) boating15. If you、*boil (boil) waterz 汁 turns (turn) into steam16. You can travel (travel) around theworld if you have(have) money.