1. am not
2. are
3. is a
4. They are teachers 
5. You roommates aren't at school
6. She isn't a visitor of the bank.
Очень странные предложения. Их между собой исправить нельзя? Учителя в колледже, бизнесмен в универе и пр?

I amn't a judge at the court
we aren't bussinesmen of the bank
He is a student at the university
you aren't roommates in the hostel
she is not a visitor in Moscow