Well there are many ways a guy could express his feelings toward you if he does happen to like you. He could ask you questions both you and him know he knows,but he wants to hear your voice. He could lean closer to you when by you. He could stare alot at you to admire your features(a little stalkerish but ok). He could even pick up your books or objects when you dropped them when no one else does.There are many more ways you can tell, but depending on the type of guy,he may not show it....
iam in love with this guy but i do not know if he likes me or some other girl
If a guy likes you but you don't know him he may look at you or walk by you whenever possible.
when he says he likes you.
http://www.wikihow.com/Know-if-a-Guy-Likes-You
Not sure how you expect someone to magically know something.
It is ok to like a guy after you know he likes you. That is perfectly normal and a part of life.
You ask the guy.
don't
When he has a penis.
his eyes will open wider if he likes it
You will know if a guy likes you because he will ask you alot of questions and he will try to get to know you better,but don't think that just because he talks to you that he likes you,make sure that they are the right person!!!
what I do is just kind of talk about what he likes or just be funny because a guy likes a sense of humor.