选修6 unit 3 Grammar---------it的用法学案.doc

Period 3 GrammarLearn aims: Revise the use of itDifficult and important points: “It” can be used in the subject or object position to stand for an infinitive, ing form or a clause. 课前预习案Previewing Case 使用说明及学法指导：1. 自学课本第87-88页里的内容或查阅资料，完成预习案。 2. 完成时间30分钟。Task 1 课文原句填空1_is a beautiful day here and I am sitting under the big tree at the end of the garden.2_seems amazing that at my age I am still fit enough to cycle 20 kilometers in an afternoon.3_my birthday in two weeks time and Ill be 82 years old!4Your mother tells me that you started smoking some time ago and now you are finding _ difficult to give _ up.5Believe me，I know how easy _is to begin smoking and how tough _is to stop.6This means that after a while your body becomes accustomed to having nicotine in_.7As you know，if you do the same thing over and over again，you begin to do _ automatically.8I didnt know，for example，that _could do terrible damage to your heart and lungs or that _was more difficult for smoking couples to become pregnant.Task 2 指出下列句子中it的用法1. It rains heavily. 2. It is 20 kilometers from Granddads house to James.3. It is November 11, 2005.4. It is 9 oclock at night.5. Itll be lovely in the garden tonight 6. It is bad to smoke.7. I found it hard to finish the task in 30 minutes.Task 3 把写句子转化为It作形式主语或作形式主语的句子。1To remember this rule is important. _2That her hair was turning grey worried her a lot. _3The way he behaves himself before girls is shameful._ 4That she should have married a farmer is surprising._5Dont you find watching television too much a waste of time?_6That his invention will lead to the development of production is certain._我的疑惑：_课堂探究案Exploring Case探究点一 it用作代词1. it用作人称代词【观察例句】(1) The frog is not a warmblooded animal. Its a coldblooded one.(2) Who is it? Its me. (3) They watched the train until it disappeared in the distance.(4) Is this your dog? No, it isnt.(5) This is our new car. I bought it yesterday. (6) They got a baby and it was a ten-pound baby.(7) Someone must have been here. But we have no idea who it was. (8) He smokes in bed and I dont like it. (9) Her mother kept telling her not to go out at night, but it didnt help. (10) I hate it when people talk with a full mouth.归纳总结：it用作人称代词，主要代替_，以避免重复; it也可指动物或性别不详的婴儿，如例句_。It还用于指人主要用确定未知人的身份，如例句_。It还可指代前句或后句所述的抽象事物或抽象环境和情景，如例句_。【练习】(1) This is my watch. _is a Swiss one.(2) I cannot find my watch; I must have lost_. (3) Where is the cat?_ is under the bed. (4) The baby cried when _ was hungry. (5) Listen. Someone is crying. Oh, _ must be Mary. (6) When the factory closes, _ will mean 500 workers will be out of work. (7) _would be ideal if you could join us. (8) Youve helped me a lot. I shall never forget _.2. it用作指示代词【观察例句】(1) Whats this? Its a map. 这是什么？这是张地图。(2) Whats that? Its a desk. 归纳总结：it用作指示代词，代替_和_。3. it用作非人称代词【观察例句】(1) It is a lovely day, isnt it? (2) It was nearly midnight when she came back.(3) It is April First today.(4) It is some 3000 kilometers from Beijing to Guangzhou.(5) -Whats the cost of the T-shirt?-It is 150 Yuan.(6) It is three dollars.(7) Today it is 30 degrees centigrade. (8) It is summer now.(9) It is about 5 kilograms.(10) It is noisy here.归纳总结：it用作非人称代词, 在以上10个例句中分别指代_、_、_、_、_、_、_、_、_、_、_。【练习】翻译下列句子(1) 他们从大厅出来时，时间是12点。_ (2) 天气又潮湿又寒冷。我认为要下雨了。_(3) 今夜，花园里景色会很美。_(4) 从你办公室到银行有多远?_ 探究点二 引导词it1. it用作形式主语【观察例句】(1) It is a good idea to have a little notebook handy.(2) Its no use crying over spilt milk.(3) It happened that the harvest was bad that year.(4) It is no use doing like that.那样做是没有用的。(5) It is important to know your limitations.(6) It is strange that it hasnt been noticed before.(7) It is very clear that hes round and tall like a tree.(8) It is against the law to do that.那这样做是违法的。(9) It is said that he has come to Beijing.(10) It is reported that another earth satellite has been put into orbit.归纳总结：it可以用作句子的形式主语，而把句子的真正主语移到后面去，句子的真正主语通常是：_，_，或_。2. it作形式宾语【观察例句】(1) We think it important to learn a foreign language.(2) We think it our duty to clean our classroom every day. (3) He felt it important learning English well. (4) They found it difficult that they would finish their work in two days.(5) The Internet makes it easier for companies to keep in touch with customers.(6) I think it best that you should stay here.(7) I think it no use arguing with him.(8) I found it very interesting to study English.(9) He made it clear that he was not interested in this subject.归纳总结：it作形式宾语，代替_，_或_。该句型中的it 作形式宾语，该结构中常用的动词有：think, believe, make ,find consider, feel；【练习】形式主语、形式宾语专项练习：1. _ happened _ he is unfit for the office.A. This; that B. That; that C. It; that D. He; that2. We took _ for granted that they would accept our advice.A. that B. this C. it D. them3. _ that the scientist will give us a talk next month?A. Is true B. Is it true C. Its true D. Its truly4. _ doesnt matter much _ dress you are going to wear.A. This; that B. That; who C. It; which D. It; who5. _ is going to America for further study.A. He is said that B. People said that heC. It was said he D. It is said that he6. They are good friends. _ is no wonder that they know each other so well.A. This B. That C. There D. It7. Is _ possible to fly to the moon in a spaceship?A. this B. there C. that D. it8. She liked _ when he kissed her.A. him B. that C. one D. it9. _ will do you good to do some exercise every morning.A. It B. There C. Those D. One10. We think _ our duty to pay taxes to our government.3 it在强调句型中的用法【观察例句】It was about 600 years ago that the first clock with a face and an hour hand was made. It was they that (who ) cleaned the classroom yesterday.It was in the street that I met her father. It was yesterday that I met her in the street.It is you that /who are wrong.It was not until she took off her dark glasses that I realized she was a famous film star.= Not until she took off her dark glasses did I realize she was a famous film star.= I didnt realize she was a famous film star until she took off her dark glasses.归纳总结：强调句型: _,被强调部分往往为句子的主语、宾语、时间状语、地点状语等，但有时也可以强调比较复杂的内容。被强调的部分如果是人，that可以由_换用，被强调的部分如果是时间状语、地点状语等一律用that。在强调句型中去掉It is/was和that后句子仍然正确。【练习】1.It was not until midnight _ the noise of the street stopped.A.thatB.thisC.since D.at which2.It was not _1920 _ regular radio broadcast began.A.for，thatB.until，thatC.for，whenD.until，when3.It was not _ you had explained how _ I managed to do it.A.for，thatB.until，thatC.for，whenD.until，whenReviewing case课后训练案一、选择题1. Its easier _ than _. A. say, do B. to say, to do C. says, does D. saying, doing2. It takes me 30 minutes _ to school by bike every day. A. going B. to go C. goes D. go3. Its not easy _ us _ a foreign language. A. for; learning B. of; learning C. of; to learn D. for; to learn4. Children find_ interesting to play computer games. A. that B. which C. it D. its5. Do you think it important _ computer well? A. play B. plays C. to play D. playing6. Is _ necessary to complete the design before National Day? A. this B. that C. it D. he7. I dont think _ possible to master a foreign language without much memory work. A. this B. that C. its D. it8. Does _ matter if he cant finish the job on time? A. this B. that C. he D. it9. Toms mother kept telling him that he should work harder, but _ didnt help. A. he B. which C. she D. it10. _ is a fact that English is being accepted as an international language. A. There B. This C. That D. It11. I hate _ when people talk with their mouths full. A. it B. that C. these D. them12. I like _ in the autumn when the weather is clear and bright. A. this B. that C. it D. one 13. _ happened _ he is unfit for the office. A. This; that B. That; that C. It; that D. He; that14. We took _ for granted that they would accept our advice. A. that B. this C. it D. them15. _ that the scientist will give us a talk next month? A. Is true B. Is it true C. Its true D. Its truly16. _ doesnt matter much _ dress you are going to wear. A. This; that B. That; who C. It; which D. It; who17. _ is going to America for further study. A. He is said that B. People said that he C. It was said he D. It is said that he18. They are good friends. _ is no wonder that they know each other so well. A. This B. That C. There D. It19. Is _ possible to fly to the moon in a spaceship? A.this B. there C. that D. it20. She liked _ when he kissed her. A. him B. that C. one D. it21. _ will do you good to do some exercise every morning. A. It B. There C. Those D. One22. We think _ our duty to pay taxes to our government. A. that B. this C. its D. it 23. Id appreciate _ if you would like to teach m