1. He said he was/had been on holiday in August.
2. After my father (had) died, the family became very poor.
3. No sooner had the singer finished his famous aria that the room burst into applause.
4. Before they met, she had worked as a waitress in a cafe.
5. Everyone thought he had died of malaria in Africa.
6. I thought they had moved into a new flat.
7. When I called her, she had already left for the holiday house.
8. No one knew what had happened to them
9. When they returned from the theater, the maid had already gone home.
10a. After he left for the North, she hasn't heard from him.
10b. After he had left for the North, she didn't hear from him.