1. Bobo was not writing a letter at 5 p.m.
2. It was not snowing when they returned home.
3. The wind was not blowing from the east.
4. The boys were not talking the whole day yesterday.
5. The boys were not talking when I saw them.
6. Nick was not waiting for Mary when we saw him near the cinema.
7. Mary was not singing when he came home.
8. It was not snowing hard when father returned home from the office.
9. The car was not moving quickly when something wrong happened.
10. I was not watching Pirates of the Caribbean at noon yesterday.