How can you tell a boy likes you in elementary?

You can get one of your friends to ask him for you , or you can ask him yourself , if your not to scared or

a)he teases you constantly

b)he gives you little hints he likes you

c)he tries to be with you whenever he can

d)he can sit down with you and talk about almost anything

e)he walks pretty close to you

f)he smiles at you