- Isn’t Istanbul a good city?
- Istanbul is a good city, isn’t it?
In (1) what is the term for how “Isn’t Istanbul” is being used here? At first it looks like its function is to act as the subject, but it looks like an extended noun phrase on second glance acting as pre-modifiers to “a good city”.
From what I can see in (2) “a good city” is the predicative nominative with “Istanbul” acting as subject. The “isn’t it” is a subordinate clause.