grammar - word order

[erudite]

-. Who’s the head of the finance department?
-. Who’s the guest speaker at the small business symposium?
-. Who’s the director’s new secretary?

I believe the basic word order in a question is usually

[An interrogative + An auxiliary verb + Subject + Verb]~

Based on this, when I tried to break down the structure of the above questions, I got confused...in the sense that....

whether I should consider [who] as the [subject] or [subjective complement]??

[TheParser]

[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?

[erudite]

Thank you very much for taking the time to answer my question^^

Your step-by-step explanation was very helpful^^