代名詞と限定詞 - 非主張的な不定代名詞と限定詞

an unspecified amount or selection of something, regardless of its quantity or magnitude

いくらか

used for referring to a person when who that person is does not matter

だれか

used to refer to a person, regardless of their identity, characteristics or specific attributes

だれか

used for referring to a thing when it is not important what that thing is

何か

one or some of a thing or number of things, however large or small

どれでも