Ответ:

1. The book hadn't been written by 1890 years.
2. I hadn't bought the presents by the time.
3. As I hadn't got him on the telephone .
4. Had the train arrived by that time?
5. the play had airedy finished when my parents errived.
6. She had finished writing letters by 10:00 o'clock.
7. Mary bought a new ring yesterday ,as she had lost her old one