[QUOTE=erudite;807860]-. Who’s the head of the finance department?
NOT A TEACHER
(1) I believe that so-called question words are treated differently.
(2) WHO is the head of the department?
(a) If you delete "who," you get: ___ is the head of the department?
(b) It appears that "who" is taking the place of the answer:
Mr. Kim is the head of the department.
(i) I think that everyone would agree that "Mr. Kim" is the subject.
(ii) Thus, I think that "who" (which is a substitute for "Mr. Kim")
must be considered the subject. Do you agree?