2. They were singing while he was playing the guitar(одновременные действия)

3. While the boy was running down the road, a dog attacked him.

4. Jack was talking to Kate when we came into the room.

5. What was Sally doing when you saw her in the street? She was shopping with a friend

6. It wasn't raining when I woke up.

7. While they were sleeping, the robber broke into the house.

8. What were you doing when Linda arrived? I was sunbathing in the garden.