cucullin wrote:I live in a metropolitan.
The word "metropolitan" is normally an adjective. (As a noun it means a special kind of bishop or a city inhabitant, and these uses are rare.)
Following the article "a" you need a noun, and the noun form of "metropolitan" is "metropolis". Thus:
- I live in a metropolis.
Your suggestion is grammatically correct though illogical (because cities are by definition metropolitan). You could, however, say something like:
- I live in a metropolitan area.
Hope this helps.