表推测的词

例It can belong to him.
can might may could有什么区别？
是否还有coulden't can't?有什么区别？

●can 通常表示现在的或“一般的能力”---即你无论什么时候想做就能做到的能力, 指单纯的表示一个人有某种能力。
You can certainly cook, even if you can’t do anything else.

can have done sth 对过去所做动作的否定或疑问推测
I don’t think he can have heard you. Call again.

Where can John have put the matches?

●may (might) have done sth 过去可能发生某事，与could相比，may和 might可能性较小，might 可能性更小;might 也可表示过去可能发生而未发生的事情。
Polly’s very late----she may (might) have missed her etrain.

You were stupid to try climbing there. You might have killed youself.

●may 可用来表达：①将来的可能性;②说话时某事可能是真实的
We may go climbing this summer. ①
You may be right. ②

●could 表达 “一般的能力”---即你过去想干什么就可以干什么
She could sing like an angel when she was a kid.
但could 不能表达过去某种具体的能力，此时用was able to, managed to 或 succeeded in 等
How many eggs were you able to get ?

●can, could, may 和might表示“允许”
①请求允许：它们都可以表示请求允许做某事,could 和 might并不是表示过去
Can (May, Could) I borrow your umbrella ?

②允许：当我们允许某人做某事时，我们用can和may来表达，而不能使用could和might
You may / can watch TV for as long as you like. (不用could, might; mustn’t 有“拒绝”的意思)
---Could I use your phone?
---Yes, of course you can /may. (No, you can’t / may not.)

●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.

couldn't 和 can't的区别大致与could 和 can的区别相同。

maybe might must be or should

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