If you want to ask a girl out, the best way to do it is in person not over the phone or online. Maybe take her to her favorite place and get to know her first. Most girls enjoy the question game because you get to know the person and after awhile, ask you out.
Ask her friends in a subtle kind of way. Don't stalk her or follow her around! If you're brave, ask her yourself!
ask subtle questions. watch her eyes and face expresion
Try a subtle approach. She will likely be frightened off by anything too intense and you don't want that happening, do you?
the same way you ask out a girl that dont have one
A romantic way to ask a girl out on her birthday would be to take her flowers and ask her in person.
What is wrong with you proposing to him? It can be done either way (boy ask girl, girl ask boy) and still be legal. Do it, and if he isn't ready he'll tell you - and you might find if you can't propose to him, that you aren't ready either.
be nice to her. talk to her. give her subtle compliments now and then.
Ask her if she wants to do lunch.
Ask her. There really is no other way.
The girl may ask the guy to walk her to class to enjoy his company, feel safer walking alone, or simply because they are friends and she enjoys his company. It could also be a subtle way of showing interest in getting to know him better.
Be creative.
Always tell her stuff about your girlfriend it is a subtle way for her to get the message. Simply telling her "no" is very effective.