how do I know if a girl likes me by body language?

Answer 1

alot of eye contact, even when youre not speaking. open body posture with arms not crossed in front of her. she should smile more often than usual. she would turn her body facing you directly when she is able to do so. there are lot of others i cant think of now

Answer 2

If she has to touch you all the time, like you will be talking with her and she might playfully punch your shoulder. then it pretty much flirting. Now if you notice her get all tense around you then she digs you. but if she is all relaxed and easy going then it is just friends. But if she laughs at all of your jokes even the lame ones then she is trying way too hard. If you notice her talking louder than usual then she is trying to catch your attention.