情態(tài)動詞表推測

1、PAGE PAGE 3情態(tài)動詞表推測本單元主要學(xué)習(xí)情態(tài)動詞must , could may, might , cant 表示推測各情態(tài)動詞表示推測時的用法Must表示說話人對事物的推測把握比較大，間為“定，一定“。只用于肯定句，否定句中的推測有”cant”。They must be in the classroom now. 現(xiàn)在他們一定在教室里。The light in the teachers office is still on. Miss Gao must be working.老師辦公室的燈還亮著，高老師一定在工作。Might ,may 強調(diào)將來或現(xiàn)在的可能性，表示推測把握不大。Th

2、e football might be Jacks. He likes all kinds of ball games.這個足球可能杰克的，他喜歡各種球類運動。Li Mei isnt here today. She might be ill.李梅今天沒來。她可能生病了。Could 也可以用來表示現(xiàn)在的可能性，推測的的把握性比較小4.。The hair band could belong to Alice這個發(fā)帶可能是艾麗絲的。她留著長發(fā)。Will you please answer the telephone ? It could be for you.你接一下電話好嗎？有可能是找你的。4.c

3、ant 表示否定的推測，意為“不可能”，把握性大There is a skirt in the case. The owner of the case cant be a boy.箱子里有一條裙子，箱子的主人不可能是個男孩。That man cant be Mr. Green . He has gone to England.那個男人不可能是格林先生，他去英國了。二、情太動詞表推測的時，用不同的形式表不不同的時態(tài)表示對現(xiàn)在情況的推測用“情態(tài)動詞+do” ; 表示對正在發(fā)生的事情的推測用“情態(tài)動詞+be doing” ；表示對已完成事情的推測的用“情態(tài)動詞+have done”.Its ten

4、oclock. They must be having classes. 十點鐘了，他們一定正在上課。Shes smiling. She must have known the good news.她在笑， 她一定已經(jīng)知道了這個好消息了。三、情態(tài)動詞表示推測時，反意疑問句存在兩種情況1. 對現(xiàn)在的狀態(tài)（或事實）表示推測時，反意疑問句中動詞用一般現(xiàn)在時。You must be a teacher , aren t you ? 你一定是個老師，對不對？They could be studying, arent they? 他們可能正在學(xué)習(xí)， 是不是？2. 對過去發(fā)生的事情表示推測時，若有過去的時章

5、狀語，反意疑問句用動詞的過去式，若沒有過去的時間狀語，反意疑問句用現(xiàn)在完成時。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?你一定把這件事告訴他了，是不是？練 習(xí) 題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