教 案题目（教学章节或主题）： if引导的条件状语从句授课日期：授课时间：教学重点、难点：重要性：典型例题： 1. Ask him to ring me up if you _ him. A. see B. saw C. would see D. will see2. If people _ polluting the air, animals and plants will die soon. A. dont stop B. didnt stop C. shall not stopD. havent stopped3. Can I stay at home tomorrow?Yes, you can if it_. A. will snow B. is going to snow C. snows D. Snowed4. I dont know if he _ this afternoon. But if he _, I will tell you. A. will come; will do; B. comes; will do C. will come; does D. comes; does 5. If you had enough money, what _? A. will you buy B. would you buy C. would you have boughtD. will you have bought6. Many Chinese movie stars now have given up their Chinese nationality. If I were them, I _ that. A. shouldnt do B. didnt do C. hadnt done D. wont do7. Ifthere nobuyingandsellingofanimals,there nokillinginnature. A.is;willheB.willbe;willbeC.is;isD.willbe;is8. Fmwaitingformyfriend. ,Illgoshoppingalone. A.IfshecomesB.IfshewontcomeC.Ifshedoesntcome9. Thestudents_haveasportsmeetingthisweekendifit_。A.wont;rainsB.will;rainsC.wont;willrainD.aregoingto;isgoingtorain总结：本次教学评价：非常满意 较满意 一般 家长或学生签字 共 小时本节课回访记录：任课老师签字： 主任签字： 日期：讲 义 学生： 任课教师：教学内容： if条件句 If people obey the traffic rules, there will be fewer accidents. 结构：if引导的条件状语从句既可以放在句子前，也可以放在句子后。从句位于主句之前时，常用逗号将 其与主句隔开。 if:从属连词，意思是：“如果，假如，倘若” 原句可改为：There will be fewer accidents if people obey the traffic rules.时态： if引导的条件状语从句，主句用一般将来时（will）,从句用一般现在时（主将从现）。 If it rains（从句）， I will stay at home. Ill go with you if you dont want to go alone（从句. 如果主句是祈使句，从句要用一般现在时 Dont go and play football if you dont finish your homework. Please call me if he comes next Sunday. 主句谓语中也可以含有情态动词，如：must,can,could,should等 【注意】主句谓语中也可以用had better(not)do,提建议 If you drive too fast, you may have an accident. You must stop if the traffic is red. If the traffic lights are red,you must stop and wait. 如果交通指示灯是红的，你必须停下来等一等。 If you want to lose weight,you had better take some exercise. 如果你想减肥，你最好锻炼。练习：用所给单词的正确形式填空 1. If you _ (want) to listen to music, _ (choose) a CD. 2. If you _ (buy) a new camera, _(get) a good one. 3. If the light _ (not come) on, _ (wait) for one minute. 4. If it _ (not work) , _ (wait) a minute and then _(try) again. 5. If you _ (not know) how to use the camera, _ (read) the instructions. 6. If you _(feel) tired, you _ (have) to have a rest. 7. Where _ he _(see) the film if he _(have) time? 8. If there _(be) fewer trees, there _( be) more pollution. 9. He _(dress) more casually if he _( not work) on weekends. 10. If Marcia _(live) alone, she _( keep) a pet parrot.【拓展】 if的反义词：if.not.=unless,意思是：“如果不，除非”练习：1. I wont go there unless I hear from you.(同义句) I wont go there _ I _hear from you. 2. I wont go to the party if I am not invited. (同义句) I wont go to the party_I am invited.条件句的转换：1. 有if引导的条件状语从句的复合句中，当主句和从句的主语均为you时，可转换为“祈使句，and+简单句”或“祈使句，or+简单句” You can pass the exam if you work hard. ，and you will pass the exam. If you dont hurry up,you will be late again. Hurry up, you will be late again.2. 借助介词with 或without来转换。 If you help me, Ill finish my job soon. , Ill finish my job soon. 如果你帮我，我将很快完成我的工作。 If there is no water, fish may die. Fish may die . 如果没有水，鱼可能会死。 【注意】1. 在if引导的条件状语从句中，当主句是一般将来时时，不能够使用be going to结构，而要用will。 Ill help you with your English if I am free tomorrow. 如果明天我有空，我会帮你学英语。 2. 在if引导的条件状语从句中不能够使用some，而要用any。 If you have any questions to ask, please come to my office. 如果你有问题要问的话，请到我办公室来。1. If you _ an interesting day out, _ the Science Museum. A. want; visiting B. want; visit C. want to; visit D. wanting; visit2. If the pure water is heated to 100 centigrade degrees, it _ boil. A. is going to B. will C. would D. is toIf条件句的虚拟语气：表示说话人的愿望、假设、猜测或建议，而不表示客观存在的事实。 If I were a child, I would be happier. If he were a bird , he could fly in the big blue sky. If I had a lot of money, I would buy a villa（别墅）. 时间从句主句与现在事实相反 were/did(动词过去式）.would/could do(动词原形) would/could/should +动词原