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课件网) Unit 4 Modals (2) must, can, may, might等表推测 能够通过观察并总结must, may, can表达推测的用法，并正确使用。 能够使用所学，谈论助人情景和提供帮助的表达。 Read the sentences from the reading passage and summarise the grammar rules. Well, crayons may carry viruses and spread diseases. (b) It can be boring to wait for X-rays and treatments. (c) There must be something for me to do. 5 Now find more sentences with these structures in the reading passage. It might sound impossible, but Leah didn’t give up. 情态动词表推测 情态动词must, can, could, may, might 均可表示推测，它们可以对过去、现在或将来的情况进行推测。 Must 通常只用于肯定句，意为“一定，准是，肯定”。 e.g. The light is off. He must be sleeping. That shop must be very good. Many people buy things there every day. can多用于否定句或疑问句中。could 可用于各种句式。用于疑问句时，can比could表示的可能性要大； 用于否定句时，cannot (can’t)表示“不可能”。 could则可用于肯定句、否定句和疑问句。 e.g. The door is locked. He can’t be at home. Can the news be true There could be life on some of the planets. may / might用于肯定句和否定句中。 在表示现在或将来的可能情况时，might表示的可能性比 may表示的可能性要小一些。 e.g. They may not know his address. I’m not sure about that. She told me that she might go to Hawaii this winter. 确定的推测 不确定的推测 (可能性依次减弱) 肯定句 must can > could > may > might 否定句 can not could not > may not > might not 疑问句 can could 1. That man _____(must / can’t) be Mr Hand. Mr Hand is much shorter. 2. The basketball _____(must / could) be Mike’s or Jim’s. They both like playing basketball. 3. Our English teacher _____(must / can’t) be working now, because the light in her office is still on. 4. —What will the weather be like tomorrow —It _____(must / might) be windy or rainy. I’m not sure. can’t could 从括号内选择合适的单词完成下列句子或对话。 must might Complete the sentences with must, may or can. You _____ be thirsty now after the long run. Here is a bottle of water for you. You didn’t bring an umbrella Take mine. It _____ rain later. Here is my notebook. You _____ return it after the exam. must may may/can 6 Look at the pictures and complete the dialogues with the correct form of the modal verbs. A: Look at that man! It _____ be hard for him to carry all the boxes! B: Let’s give him a hand. 7 must Dialogue 1 A: Is that Lily over there B: It _____ be her. She has the flu and has to stay at home. A: That’s too bad. The lesson today is really important. B: Don’t worry. We _____ share our notes with her. can’t can A: That woman looks lost. She _____ need help. B: Yes. We _____ go and ask her. Dialogue 2 Dialogue 3 may can Choose a dialogue and role-play. A: Look at that man! It _____ be hard for him to carry all the boxes! B: Let’s give him a hand. must Dialogue 1 A: That woman looks lost. She _____ need help. B: Yes. We _____ go and ask her. Dialogue 2 may can A: Is that Lily over there ... ...
