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Краткий ответ — упражнение 233

1. Tom returned from the cinema at five o’clock.
2. Tom had returned from the cinema by five o’clock.
3. I finished my homework at seven o’clock.
4. I had finished my homework by seven o’clock.
5. He thought that he had lost the money.
6. Ann told me that she had seen an interesting film.
7. When I came home, mother already had cooked dinner.
8. When father returned from work, we already had done our homework.
9. When the teacher entered the classroom, the pupils already had opened their books.
10. Kate gave me the book which she had bought the day before.
11. Nick showed the teacher the picture which he had drawn.
12. The boy gave the goats the grass which he had brought from the field.
13. Mother saw that Nick had not washed his hands.
14. The teacher understood that Lena had not done her homework.
15. I knew that my friend had not yet come.
16. When I woke up yesterday, father already had gone to work.
17. Nick thought that his father had not yet come home.
18. Mary told us that she had cooked a good dinner.
19. Yesterday I found the book which I had lost in summer.
20. When we came to the station, the train already had left.

Как выбрать время

• Past Simple — действие произошло в определённый момент в прошлом:
  at five o’clock, yesterday → returned, finished, came.
• Past Perfect — действие произошло раньше другого действия в прошлом:
  had + V³ → had returned, had done, had left.

Например, в предложении 20 сначала поезд уехал — had left, а потом мы пришли — came.
В предложениях 2 и 4 слово by означает «к определённому времени уже», поэтому используется Past Perfect.

Проверка: в предложении 7 сначала мама приготовила ужин, а затем я пришёл домой: had cooked → came.