there's a lot of really bad advice on here

this advice is or two things are ok but really...every girl is different. best advice....if you think she likes you...ask her for a drink. if she says yes...your in (just dont say anything stupid). if she says no...just be friendly with her and move on with life...she may get with you one day...or who knows. she may end up introducing you to someone else because all tho she doesn't fancie you she might still think your a good match for her sexy pal.