Desu ne is something you want to tell them that you felt right or after the question you ask (with someone Same age, really friendly with ỏ ưith the person is younger than you)
And Desu ka? Is the word like "right?" Is the Question too. Usually they use to the person you not really friend or the person older than you (formal)
In Spanish they use hola, and in French they use salut, and in German they say hallo
While there are suburban communities or NYC, the city itself is an urban community. It is a very large city.