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 youre 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
---Theres someone coming up the stairs.
---Thatll be Mary.
Youll start work at six oclock.
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.
Ill 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wont表示拒绝
No, I wont !
She wont 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)。
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