1. She is a teacher. ⇒  She isn't a teacher. ⇒  Is she a teacher?
2. They're in Berlin. ⇒  They aren't in Berlin. ⇒  Are they in Berlin?
3. It's a nice day. ⇒  It isn't a nice day. ⇒  Is it a nice day?
4. I am very excited. ⇒  I am not very excited. ⇒  Am I very excited?
5. We are students. ⇒  We aren't students. ⇒  Are we students?
6. You are right. ⇒  You aren't right. ⇒  Are you right?
7. It's 6 o'clock. ⇒  It isn't 6 o'clock. ⇒  Is it 6 o'clock?
8. The table is blue. ⇒  The table isn't blue. ⇒  Is the table blue?
9. He is the new manager. ⇒  He isn't the new manager. ⇒  Is he the new manager?
10. They are sorry. ⇒  They aren't sorry. ⇒  Are they sorry?