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