1. shall用于一、三人称疑问句表示征求对方意见;用于二、三人称陈述句表示说话人给对方的命令、警告、允诺或威胁等

   ①“The interest     be divided into five parts, according to the agreement made by both sides,” declared the judge. (2004年重庆卷)

   A. may      B. should       C. must      D. shall

  ②-Excuse me, but I want to use your computer to type a report.

   - You ______ have my computer if you don’t take care of it. (2004年湖南卷)

   A. shan’t     B. might not     C. needn’t     D. shouldn’t

   ③ - The room is so dirty. ______ we clean it?

   - Of course. (2003年北京春季卷)

   A. Will      B. Shall       C. Would      D. Do

   2. must用于疑问句,表示责备、抱怨的感情色彩,意思为偏偏,偏要;mustnt表示禁止,是说话人强有力的劝告

   ①John, look at the time. _______ you play the piano at such a late hour? (2005年全国卷Ⅲ)

   A. Must      B. Can        C. May       D. Need

   ②Tom, you   leave all your clothes on the floor like this!(2005年全国Ⅰ)

   A. wouldn’t    B. mustn’t      C. needn’t    D. may not

   3. neednt表示没有必要

   - Lucy doesn’t mind lending you her dictionary.

   - She ______. I’ve already borrowed one. (2005年湖南卷)

   A. can’t       B. mustn’t     C. needn’t      D. shouldn’t

   4. would表示过去反复发生的动作或某种倾向。

   When he was there, he ___ go to that coffee shop at the corner after work every day.(1996年上海卷)

   A. would       B. should     C. had better    D. might

  5. 表示经过努力而成功的某一次动作,只能用was/were able to,而不能用could。

   The fire spread through the hotel very quickly but everyone _____ get out. (1997年全国卷)

   A. had to      B. would      C. was able to    D. could

   6. 考查情态动词用作答语的情况

   ①-Write to me when you get home.

   - _______. (2001年北京春季卷)

   A. I must      B. I should     C. I will     D. I can

   ② - Could I call you by your first name?

   -Yes, you ______. (1998年上海卷)

   A. will       B. could       C. may       D. might

 巩固练习:

1. Michael ______ be a policeman, for he is much too short.

   A. needn’t     B. can’t       C. should     D. may

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