can you...could you...怎么区别?还有may,should

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can you...could you...怎么区别?还有may,should
初二上学期学了can you...could you...怎么区别呢?还有may,should

1.could you 表示比can you更委婉客气的请求,多用于下对上或幼对长,例如：Could you give me some money,mum?
2.may表示允许（might表示更客气的允许）,
May I sit here.
3.should表示劝告或建议,与ought to意思相同.
You should drink more water.

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