1. We usually listen to music on t.v. but we are listening to music on the radio.
2. They have been writing letter for two hours.
3. The students were talking when the teacher entered the room.
4. Sally was drawing while her cousin was looking on the window. It was snowing outside.
5. When Ann arrived home the party had already started.
6. David has found the money.
7. Paul has been dancing at the club since 10.
8. You brought the presents after you had gone shopping.
9. My puppies ran all round the house an hour ago. They have not run in a park yet.
10. Your neighbors bought yesterday this beautiful car.
