Can be 和must be的区别

can be表猜测 must be表肯定
把我的笔记弄下来给你看看好了.
例子:-Look!The man over there is wearing a red shirt the same as Lee.
-he can be Lee. I think.
-Look!The man over there is wearing a red shirt the same as Lee. I think only Lee has such a stupid shirt.
-He must be Lee.
例子2:can't be是must be 的否定
-Look!The man over there is wearing a red shirt the same as Lee.
-he can't be Lee. He went to Shanghai yesterday.

可能是：It can be five dollars. 可能是5元钱。
一定是：It must be five dallars. 一定是5元钱。

can be 表示推测
must be 表示一定