what did Diane say?
what Diane said?
How do you understand which one is correct? The book that i study myself says if question words(who/what) is subject of the sentence do/did is omitted. My problem is that i can not understand if its subject or object of the sentence.
Who lives here?
Who does live here?
To me, both sounds correct. So my question: is there a way to find the correct form without looking subjects or objects of the sentence. and does native speakers find the correct form like i do? Thanks