What are the signs that a girl knows you like her?

this is from a girls point of view:
girls won't say to you "i know you like me" unlessshe is positive you do , and you have said this to someone, as she finds this is embarrasing. if you are in a convesation with others about who you fancy.......and she is there she might try to catch you eye, if you look at her she'll give you a knowing look back- not neccessarily meaning she fancies you too