2. You may telephone if you will accept this job.
would可以表达“过去习惯做……”类似于“used to do”
例句：
1. When we were children, we would go swimming every summer in that river.
表示请求，固定的句型：Will/Would you please do…? / Would you like to do…?
例句：Will/Would you please give him a message when you see him ?
shall
1. 用于第一，三人称，表示“请求”；“建议” 或“推荐”
例句：
1. Shall we start the meeting now?
2. Shall I watch TV now ?
3. Shall my son carry the case for you ?
2. 用于第二人称，表示“命令，“要求”，“许诺”
例句：
1. You shall take whatever you like.
2. You shall not go to the party with me if you make so much noise again.
在表示推测的否定句或疑问句中，常用can /can’t /could / couldn’t表示，意思是：“可能…吗?”；“…不可能…”。而不能使用mustn’t或must等词。
www.kuaixue5.com【典型例题】
1. —Do you think he will do me a favor ?
—As far as I know, he is the last one to help others. He _____ be prepared to give you a hand, though.
A. might B. must C. can D. should
分析：本题考查情态动词推测性用法。 根据he is the last one to help others.（他是最不可能帮助别人的人），既然如此，那么“帮助你”的可能性也就最小了。 答案为A
2. —Look, someone is coming. Guess who it ____ be ?
—I think it ___ be Tom.
—I don’t think it ___ be ____ .
A. can ; must ; can ; he B. may ; can ; must ; him
C. must ; can ; must ; his D. might ; must ; can ; himself
分析：根据备选答案。 can表示推测时用于疑问句或否定句中。本题首句就应该是Guess who can it be? 第二句应该是I think it must be Tom.（说话人十分肯定）。第三句表达了说话人对前一个人的否定。即：I don’t think it can be him/he.（不可能是他）。答案为A
3. —Do you know Ms. Wang likes walking after supper ?
—Sure. She ____ around the campus now.
A. must be walking B. must walk
C. may walk D. may be walking
分析：关键词Sure告诉我们说话人的口气十分肯定。根据句子语境：她此刻肯定正在校园散步呢。must be doing表示肯定正在做。答案为A
4. —I stayed at a hotel in New York.
—Oh, did you ? You _____ with Barbara.
A. could have stayed B. could stay C. would say D. must have stayed
分析：首句说：我在纽约住在一家宾馆里。在此a hotel是泛指。所以D选项不合题意。第二句在说：你本来可以和Barbara.住在一起的。Could have done表示：本来可以。答案为A
5. Why didn’t you tell me there was no meeting today ? I _____ all the way here through the heavy snow.
A. needn’t have driven B. can’t have driven
C. mustn’t have driven D. shouldn’t have driven
分析：根据句意：你为什么不告诉我今天没有会？我本来没必要冒着大雪开车跑这么多路。Needn’t have done表示本来没必要。答案为A
6. I was really anxious about you. You _____ home without a word.
A. mustn’t leave B. shouldn’t have left
C. couldn’t have left D. needn’t leave
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