表推测的词例It can belong to him.can might may could有什么区别?是否还有coul

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.