情态动词表推测

1、PAGE PAGE 3情态动词表推测本单元主要学习情态动词must , could may, might , cant 表示推测各情态动词表示推测时的用法Must表示说话人对事物的推测把握比较大，间为“定，一定“。只用于肯定句，否定句中的推测有”cant”。They must be in the classroom now. 现在他们一定在教室里。The light in the teachers office is still on. Miss Gao must be working.老师办公室的灯还亮着，高老师一定在工作。Might ,may 强调将来或现在的可能性，表示推测把握不大。Th

2、e football might be Jacks. He likes all kinds of ball games.这个足球可能杰克的，他喜欢各种球类运动。Li Mei isnt here today. She might be ill.李梅今天没来。她可能生病了。Could 也可以用来表示现在的可能性，推测的的把握性比较小4.。The hair band could belong to Alice这个发带可能是艾丽丝的。她留着长发。Will you please answer the telephone ? It could be for you.你接一下电话好吗？有可能是找你的。4.c

3、ant 表示否定的推测，意为“不可能”，把握性大There is a skirt in the case. The owner of the case cant be a boy.箱子里有一条裙子，箱子的主人不可能是个男孩。That man cant be Mr. Green . He has gone to England.那个男人不可能是格林先生，他去英国了。二、情太动词表推测的时，用不同的形式表不不同的时态表示对现在情况的推测用“情态动词+do” ; 表示对正在发生的事情的推测用“情态动词+be doing” ；表示对已完成事情的推测的用“情态动词+have done”.Its ten

4、oclock. They must be having classes. 十点钟了，他们一定正在上课。Shes smiling. She must have known the good news.她在笑， 她一定已经知道了这个好消息了。三、情态动词表示推测时，反意疑问句存在两种情况1. 对现在的状态（或事实）表示推测时，反意疑问句中动词用一般现在时。You must be a teacher , aren t you ? 你一定是个老师，对不对？They could be studying, arent they? 他们可能正在学习， 是不是？2. 对过去发生的事情表示推测时，若有过去的时章

5、状语，反意疑问句用动词的过去式，若没有过去的时间状语，反意疑问句用现在完成时。It must have rained last night, didnt it “ 昨晚一定下雨了，是不是？You must have told him about it , havent you?你一定把这件事告诉他了，是不是？练 习 题A: whose book is this?B: It _ be Johns .There is his name on it.A. might B. may C. must D. shall2. A: Listen ! Is Professor Johnson giving a

6、 report in the hall? B: No , It _ be him. He has gone to Japan. A. neednt B. man not C. mustnt D. cant3. A; Look! The man at the gate _ be our headteacher. He is always standing there every morning B: No , It _ be him He is holding a meeting in the office now. A. must , cant B. must , mustnt C. cant

7、 , cant D. cant, mustnt4. Anna hasnt come to school today. I think she _ be ill. A. can B. has to C. may D. should5. A: Another cup of coffee. B: No , thanks . I _ be off. Mary is waiting for me A. can B. may C. must D. must6. Mr. Brown must have returned yesterday, _? A. mustnt he B. must he C. did he D. didnt he 7. Henry _ be at home because he phone me from the factory just now. A. mustnt B. might C. must D. cant8. Ann doesnt look well. She _ be ill.9. A: Where is my pen ,Dad? B: It _ be in your pocket. Im not sure.10. Li Ming _ be in the classroom. I saw him