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Відповідь:

1. By the time we arrived at the party, they had already eaten all the pizza.

2. I had studied for three hours before taking the exam.

3. He had never seen snow before he went on his winter vacation.

4. After the concert, the band had signed autographs for their fans.

5. The restaurant had closed by the time we got there.

6. She had forgotten her phone at home and didn't realize it until she arrived at work.

7. They had lived in the same house for 20 years before moving to a new city.

8. The movie had already started when we arrived at the cinema.

9. I had finished reading the book before the library asked for it back.

10. The train had left the station before we could buy our tickets.

11. He had broken his leg skiing last winter and couldn't play basketball until it healed.

12. By the time I woke up, my roommate had already left for work.

13. She had learned to play the piano when she was a child but hadn't played in years.

14. The students had completed the project before the deadline.

15. The athlete had won the gold medal in the previous Olympics before retiring.

they had not been married when i was born

until he went to spain, he had not spoken sspanish

i went there after i had completed the task

my father and mother has been married for two years when i was born

they had been being friend since childhood

you hadn't been studing english all day