What the difference between using か and が for a question? So what's the difference between asking: And:

Your question ultimately boils down to the difference between two particles: and .

* is a question marker, and an indefinite marker. After an interrogative pronoun like ( _"who"_ ), ( _"when"_ ), or ( _"what"_ ), forms the indefinite -- ( _"*somewho"_ ⇒ _"someone"_ ), ( _"*somewhen"_ ⇒ _"sometime"_ ), ( _"*somewhat"_ ⇒ _"something"_ ).

* is mostly a subject marker (and sometimes, in archaic constructions, a kind of possessive linker between nouns). would be _"who"_ as the subject of a sentence.