Hi theartichoke! ^^Hi key,
It depends on what exactly you want to know from your friend. Could you give us more context? For instance, are you asking your friend if he's romantically attracted toward this girl? Whether he thinks she'd be appropriate to hire as an employee? Does he know her? Are they friends? It makes a difference with the preposition.
I guess, from your proposed question, that your friend has recently met a young woman. Either about or toward would work in your question (we'd more likely use about); "for" would not be right.I will ask my friend his opinion when he sees somebody or something.
I'd like to use 'feel'.
Then, which preposition should come with 'feel', for or about or toward?
(How do you feel for/about/toward her?)
It's not easy to explain the exact difference between "how do you feel about her?" and "how to do feel toward her?" except to say that "about" can be used in more contexts than "toward" can. "How do you feel toward her?" is very specific: I would use it only in cases where there was already a relationship (not necessarily a romantic one) between the addressee and "her"; I don't think you can have feelings "toward" someone you haven't met, even if you find that person attractive. And I would probably only use it if the addressee's feelings toward "her" were in doubt.Actually, this question is about whether he is romantically attracted toward her or not.
But, now that I read your explanation, I'd like to study everything. Can you do me a favor? Could you explain which preposition I should use in each situation that you mentioned?