How do you find out whether a girl has a boyfriend without asking her?

If she's a fairly well-known friend, just ask her casually on a daily basis "how's it going?" or something. You can ask her about her plans on the weekend without implying you want to do something with her. If she has a boyfriend and spends time with him, I would think she'd bring him up.

Ask around, but chances are if you haven't heard about a boyfriend then she most likely doesn't have one. But if you really want to know just bring it up casually in a conversation with her just to see.

Spend more tie with her sort of stalkish if she isnt calling anyone like that or spending time with other boys/girls flirtingly then if you still dont find out casually ask her

easy i usually ask in a senaky way id play around and ask you better not mess with me or ill tell your boyfriend and usually if she is single she will say i dont have a boyfirend or some will say so what go ahead and tel him.

just be natural and along the way of the converstion say something like "and what does your boyfriend think about that" or "I'm telling your boyfriend"

you just say 'are you single'

guys have asked me that all the time I think nothing of it.

ask one of her friends

ask one of her friends

ask her friend, or if she is flirting with you or other guys then most likly she is single

She'll tell you ;)