Reply to "what: subject or object"

Dear David and Gustavo.

Please forgive me for my absent-mindedness. 

At first, I was right when I thought that ''the matter'' was a subject complement. 

But then my mind appeared the sentence " What is your hobby?" 

Comparing the two sentences: ''What is the matter?''; ''What is your hobby?'', I was confused, they are so identical in grammatical structure. 

Now I understand completely. I promise I won't ask such a kind of question.

Thank you both for helping me with all your heart and I am a student with my bad mind which worth punishing. 

Last edited by cocoricot
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