Ex.1
1. At 4.30 she was chatting on the phone.
2. The boys were playing football in the park yesterday afternoon.
3. He wasn't doing his homework in the evening.
4. They weren't listening to music at 5 o'clock yesterday.
5. Was he riding a bike last Saturday at 7 p.m.?
6. What were you watching yesterday at 5 p.m.?