1. He lived in London before he went abroad.
2. I earned a lot of money, but then I lost my job.
3. I'm surprised that they joined the tennis club. They didn't like tennis.
4. Did you travel a lot before you became a teacher?
5. That radio worked before I dropped it.
6. We saw them every week, but then we had an argument.
7. She played tennis a lot before she broke her leg.
8. She drove a lot before she had an accident.
9. We had a garden, but then we moved to a different house.
II
1. While Tom was reading, Mai Ly was watching a documentary on TV.
2. Mark came home, switched on the computer and checked his emails.
3. The thief sneaked into the house, stole the jewels and left without a trace.
4. Nobody was listening while the teacher was explaining the tenses.
.5 While we were doing a sight-seeing tour, our friends were lying on the beach.