1. When father returned from work, we had already done our homework.
2. Kate gave me the book which she had bought the day before.
3. Mother saw that Nick hadn't wash his hands.
4. I Knew that my friend hadn't come yet.
5. I had finished my homework by seven o'clock.
6. Ann told me that she had seen an interesting film.
7. Nick thinked that his father had already come home.
8. When we came to the station, the train had already left.
9. Yesterday I found the book which I had lost in summer.
10. Richard (to have) his dinner by 6 o'clock.