1. We had done our homework before father arrived.
2. I had had dinner before nine o'clock.
3. He had not learnt the poem until the evening.
4. They had built a fire before sunset.
5. The pupil on duty had wiped the board before the teacher arrived.
6. I had not translated the article until morning.
7. Had the children fallen asleep until ten o'clock?
8. Why had not he sent the letter before the holiday?
9. Who had finished the work before six in the evening?