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(Show the screen.) 1.-Would you like to come to a party? -I’d love to. 2.-Have you listened -No, but I plan to. 3. You don't have to eat it if you don't want to. T: When the infinitive phrase is used as subject, the formal subject “it” is often used, that is, “It's+n./adj. + infinitive”. If we need to tell who performs the action of the infinitive, we can put "for sb./for sb. " before the infinitive. (Bb: It's + adj. / n. + for/of sb. + infinitive.)Some adjectives, such as, kind, good, wise, stupid, foolish, careless, clever…, must be followed by “of sb. to do sth. ” In this case, the sentence emphasizes “per- son”. If we use “for sb. to do sth.” it emphasizes “thing”. Please look at the sentences on the screen and compare them, then fill in the blanks with “of” or “for”. (Show the exercise on the screen.) 1. It is silly us to believe her. 2. It is impossible the task so soon. 3. It is nice you to help me. 4. It is necessary us to take exercise. (Teacher asks four answers.) Suggested answers: 1. of 2. for 3. of 4.for T: Now look at the sentences on the screen. Pay attention to the forms of the infinitive in the sentences. 1. She asked to be sent to work in Tibet. 2. I am glad to have seen your mother, 3. We didn't expect you to be waiting for us here. T: In the first sentence, the passive infinitive is used, which expresses a passive action. In the second sentence, we use the perfect infinitive. When do you think the perfect infinitive is used? Ss: When the action expressed by the infinitive happens before the predicate, the perfect infinitive should be used. T: Quite right. Now look at the third sentence. The continuous form of the infinitive is used. When the action is happening, we use the continuous form of the infinitive. (Bb: to be done, to have done, to be doing) T: Now let's do an exercise. (Show the exercise on the screen.) Choose the correct answers: 1. I have two letters today. 2.1 have no letters today, thank you. A. to type B. to be typed 3. I'd like to to the cinema to night. 4. I'd like to to the cinema last night. A. go B. have gone 5. When his mother came in, the little boy just pretended . A. to read B. to have read C. to be read D. to be reading Suggested answers: 1. A 2. B 3. A 4. B 5. D T: Besides, the infinitive can also be used as predicative, attribute, adverbial for purpose and for a disappointing sequel. Now look at the sentences on the screen. Pay attention to the usages of the infinitive. 1. He doesn't seem to like the idea. 2. The boy uses a computer to play games. 3. She hurried to the station only to find the train had gone. 4. There are letters to be typed. 5. I have nothing to do. 6. Please pass me a pen to write with. (责任编辑：admin) |