Hi GG Yes, of course. Actually, in your sentences the relative pronoun has been omitted: This is the street [that/which] I live on.. This is the town [that/which] I was born in.
Where "contains" in, and for that very reason it is impossible to omit it. For where to be omitted, one should find an instance in which the omission of in
I wasn't disagreeing with you at all - I hope that came out. I was just trying to show the original poster some alternatives if he wanted to drop the "where."
I'm not mother language english, but I would say you can omit 'where' in cases similar to the one you mention: //ex. the city I have lived in is beautiful // may be the 'in' after 'lived' makes 'where' sort of redundant? marialberto