5、can和could表示提议和请求
它们常用来提议为某人做某事或请求别人做某事，could更客气，更
含尊敬的成分，这种用法常见于陈述句和疑问句中
①提议：
Can I carry your bag ?
I could / can do the shopping for you, if you’re tired.
②请求和命令：
Could / Can you help me with this letter?
You can / could start by cleaning the car.
6、情态动词will
①预测未来（第一人称用shall)，或发布命令
---There’s someone coming up the stairs.
---That’ll be Mary.
You’ll start work at six o’clock.
②自愿与意向
●I will (不用 I shall) 表示自愿做某事，或主动提出做某事，或表达坚定的意图
---Can somebody help me ?
--- I will.
I’ll break your neck.
●will you常用来提出要求或下命令，或提出请求
Will you come this way, please?
Will you have some more wine ?
●用won’t表示拒绝
No, I won’t !
She won’t open the door.
7、shall
用于第一人称，表示征求对方的意见(说话人做某事)。
用于第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。
用于第二、第三人称，表示说话人给对方的命令、警告、允诺或威胁。
8、常用情态动词的回答
①---Must we hand in our plan ?
---Yes, you must. (No, you needn’t.)
②---Need I come ?
---Yes, you must. (No, you needn’t.)
③---May I smoke here ?
---Yes, please. (Certainly. / Yes, you may. )
(No, you mustn’t. / may not. / Please don’t.)
④---Could / Can I offer you some coffee ? (提议)
(---Will / Would you have some coffee ?)
---Yes, please. / Yes, I’d like some ,please. (不用Yes, you can.)
(No, thank you.) (不用No, you can’t.)
⑤---Could / Can / Would / Will you (please) open the door ?(请求)
---Yes, of course (I will). (No, I’m afraid I can’t.)
09年高考英语语法精要讲解二十六：情态动词2
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