Перевести в past perfect. 1. я поужинал до девяти часов. 2. он не выучил стихотворение до вечера. 3. они развели костёр до заката солнца. 4. дежурный вытер доску до прихода учителя. 5. я не перевёл статью до вечера.

1. I had had dinner before nine o'clock.
2. He had not learned the poem by the evening.
3. They had built a fire before sunset.
4. The pupil on duty had wiped the board before the teacher came in.
5. I had not translated the article before the evening.