What are some things girls will do to lead you onto show they like you without coming out and making itobvious

What are some things girls will do to lead you onto show they like you without coming out and making it obvious? I have always had a problem with this when other people will say ooo yea she likes you but, I can never tell if there messing around with me or not. What sighns should I look for from the girl or things she say that will be a hint?