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1、Unit 13 People Lesson 3 Making Guesses 第2课时情态动词表推测的用法归纳总结。1must用于肯定句中，意为“想必是，准是”，表示肯定的推测。mustThe ground is rather wet，so it must have rained last night，didnt it?地上非常湿，所以昨晚一定下雨了，不是吗？2may/might/could用于肯定句中，意为“有可能”，表示不太肯定的推测。may/might/couldJane might be sleeping this time of day.现在这时候简可能正在睡觉。3can表推测时，主
2、要用于否定句和疑问句中；但表示客观可能性时用于肯定句中，常译为“有时也会，有可能”。Where can Mary have gone？She cant have gone to school.It is Sunday.玛丽究竟到哪里去了？她不可能上学去了，今天是星期天。In spring，it is usually warm here，but sometimes it can be cold.春天，这里通常很暖和，但有时可能会很冷。4“情态动词have done”的用法。(1)can have done表示对过去发生的行为的怀疑和不肯定，通常用在疑问句和否定句中。He cannot have
3、forgotten it.他不可能忘记的。Can he have gone to his aunts?他可能去了姑姑家吗？(2)could have done可用来表示推测，意为“可能已经”，也可以表示“本可以做某事而未做”。He wasnt at home last night.He could have gone to movies.他昨晚不在家，可能去看电影了吧。The accident could have been avoided.这场事故本来是可以避免的。(3)should/ought to have done意为“过去该做某事而没有做”，表示说话者“后悔、遗憾或责备”的语气。I
4、really regretted wasting the hours when I should have studied hard，but it was too late.我真后悔我浪费了本该努力学习的光阴，但现在后悔已经晚了。(4)shouldnt/oughtnt to have done意为“过去本不该做某事却(已经)做了”，也表示说话人后悔或责备的语气。Im sorry for the words I shouldnt have said to you at that moment.我很抱歉我所说的话，我当时本不应该那样对你说的。(5)neednt have done表示“本不必做某事
5、却已经做了”。Look，you neednt have bought those sweaters for me.I have just knitted one.看，你本不必给我买那些毛衣，我刚织了一件。 (三) Classroom assessment 课堂检测 I. Complete the sentences using the following modals: 领悟句意再选情态动词填空 could might must should cant1. That restaurant be very good. It is always empty. 2. Youve been worki
6、ng all night long. You be tired.3. When you have a small child in the house, you not leave small objects lying around. Such objects be swallowed, causing serious injury or even death.4. Oh no! Franks wallet is lying on the coffee table. He have left it here last night.II. Choose the best answer to e
7、xplain the given situations. 领悟情景再填空 must have cant have1. The coat you bought is very good quality. It been very expensive.2. Dan passed his exam with excellent grades, despite not having prepared it. The exam been very difficult.3. Christie did the opposite of what I asked her to do. She understood what I said.4. When I got home last evening, I found my door smashed. Someone broken in.
