How would you know if A man really likes you ?

This might sound odd, ask him. Yep... that would pritty much solve this one. You can even say "Because of X Y and Z, I am getting the impression you like me" from here you can tell him how you feel ie: "stop doing x y and z because i dont like you" OR "want to go for a coffee together?"

For me if a girl pleases me fist of all as i see her i will smile or try to talk to her.Its so easy to know what is there in a man's heart unlike that of girls.

I think that these are all good ways to tell if he likes you. I have always heard that if he crosses his legs toward you he liked you. Body language is so important. DOes he try to touch you at certain times and then pretend it was an accident? That is also a good way to tell. If you find him reaching for the same things just for the oppotunity to touch your hand or "accidentally" bushing your shoulder with his as you are walking along? Just be careful to realize the differance between like and lust... There are certain things they will do just to try to get in your pants... Just avoid the accidentally touching below the waist. The legs and things that is usually a sign of lust not love...

by his body language look at which direction he has his feet pointing. If they point towards you he likes you. Also the way he acts around you if your on your own and he's fine but a bit of a idiot when other people are around then he likes you

i think he'll go out of his way just to be with you, just to talk to you, just to see you. he's very thoughtful and caring of you.