1. By the time Jackson (arrive) …arrived………………… to help, we (already/ finish) ……………had already finished…………… moving everything.
2. Alexander Graham Bell (invent) ……………had invented…… the telephone by the time I (be) …………was………… born.
3. The farmer's barn caught on fire some time during the night. By the time the fire fighters (come) ……………came………… , the barn (burn) ……had burn…………… to the ground. It was a total cost.
4. Last year, I (go) …………went……… mountain climbing for the first time. It was exciting and terrifying at the same time. We (move) …moved…………… slowly and carefully, and it (take) ………took……………… three days to get to the top. Imagine our surprise when we climbed onto the summit and found another group of climbers. They (arrive) ……………arrived…… several hours ahead of us. They were having dinner and listening to Beethoven. We(laugh) …………laughed………… , and they (invite) ………invited…………… us to join them. The climb (be) ……was…………, to say the least, an unforgettable experience.
5. As Brian was introduced to Mrs. Hill, he (realize) …………realized………… that he (meet) ………had met………… her before.
6. At the conference, scientists (report) …………reprted………… that they (find) ………had found………… a cure for AIDS.
7. The waiter (take) ………had taken…………… our plates away before we (finish) ………………finished……… eating.
8. Ursula refused to have dinner with us. She (already/ eat) ………had already eaten………… it.
9. Before Ceilia (leave) …………left…………… the party, she (say) …………had said……… good bye to her friends.
10. The ship (cover) …………was covering………… half the distance when it (hit) ……hit………………… a huge iceberge.
11. After the politician (retire) …………had retired………… from his political life, he (begin) ………began…………… to write his autobiography.
12 after Linda (run) …………had run……… all way home, she (feel) ……felt……………… exhausted.
13. The accountant (deny) ……………denied………… that she (take) ……………had taken………… the money from the office.
14. Lan's friend (thank) ………thanked………… her because she (help) ………had helped………… him with the nuisance.
15. The boy (apologize) ………apologized……………… to me because he (take) ………had taken…………… my raincoat unintentionally.