help me !

Could you give an example or two of what exactly you are asking about, please? It isn't clear what exactly you want to know.

example : Tom is impossible to climb up the top of the hill ! => this sentence is wrong, cuz, the word impossible isn't used to subject ( men ), right ???

Tr?n Nghia SonTom is impossible to climb up the top of the hill ! => this sentence is wrong,

Yes. It's wrong to say that a person is impossible to do something. However, we could say "It's impossible for somebody to do something". For eg It is impossible for Tom to climb up the top of the hill.

tks ! hoping that you will help me more than in following sentences !

We also can say in a general way that a person is impossible. It's a loose expression meaning that the person is difficult to like and very hard to work with, for instance because he is rude, or haughty, or inconsiderate, or has any one of a number of other disagreeable characteristics.

hello Thomas ! can u give me some examples ?

Hello Tr?n Nghia Son.

This is an English forum, so we'd better write you out in full.

If you look carefully at my post, you'll see I have already given you examples of the circumstances in which we might call a person impossible.