Help with question word だれ

Question

Every example I see with だれ and a copula has だれ placed at the end (あの方はだれですか。) Will changing the order to だれがあの方ですか。be acceptable or mean something else?

Also, how do I write "Who has A car?" I want to say だれがくるまがありますか but it looks odd having 2 が　particles.

Answer 1

Will changing the order to だれがあの方ですか。be acceptable or mean something else?

Yes, it is OK to put "dare" like that. I think the meaning change can be translated like this:

誰がボスか。= who is the boss? (which one of these people is the boss?)

ボスは誰か。= who is the boss? (what is the identity of the boss?)

Answer 2

For the first question, no, you cannot reverse the word order. It becomes ungrammatical.

As for "Who has a car?", だれがくるまがありますか is fine even though this makes two がs. Note that you can replace the first が with に if having two がs bothers you.

だれにくるまがありますか　→　"Unto whom is there a car" / Who has a car?

See this post for info on replacing が with に.