Anata is used as an emphasis on that person being the "out group". Otherwise rude as in "Hey you, person not aphiliated with me" Somewhat rude.. especially to your superior :P

=-koto ga aru/ koto aru = x's something before (experienced it) Mitte -mitemasu. See.

Nihonjin ja nai. Americajin desu.... I'm black.... =/ (Jamaican)