09年高考英语语法精要讲解二十六:情态动词2

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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.)


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