How can a girl know if a boy wants to go out with her?

well you hang kinda join in with them like saying hey and joking around with them and stuff then you kinda get closer to each other then you get him to like you but how you know if a boy likes you is if he is shy to go near you or he just looks at you all the time.

Take a chance, smile at him. If he smiles back, you know. Don't wait for him to make the first move, you can ask HIM out.