1. We had been playing tennis for about an hour when it started to rain heavily.
2. I was very tired when I got home. I had been working hard all day.
3. At last the bus came. He had been waiting for 20 minutes.
4. Jim quit drinking coffee two years ago. He had been drinking coffee for 20 years.
5. She was out of breath. She had been running.
6. It wasn't raining when we went out. The sun was shining. But it had been raining, so the ground was wet.
7. We were extremely tired at the end of our trip. We had been traveling for more than 24 hours.
8. I was exhausted at the end of the test. I had been writing for over three hours.
9. The orchestra had been playing for 30 minutes when a man in the audience suddenly began shouting.
10. At the time the factory closed down, Sarah had been working there for five years.
11. Had she been watching TV for 4 hours before she went to eat dinner?
12. She was very upset because I was late and she had been waiting for a very long time.
13. When the boys came into the house, their clothes were dirty, their hair was messy and one of them had a black eye. They had been fighting.
14. It was a bit discomfort to arrive at their house and found Liz looking so depressed. I think she had been crying before I got there.
15. I had been learning German for 4 years and then decided to give it up.

1. Câu này sử dụng thì quá khứ hoàn thành liên tục để diễn tả một hành động đã bắt đầu và tiếp tục trong một khoảng thời gian trước một sự kiện khác trong quá khứ.
2-15. Tương tự như câu 1, chúng ta sử dụng thì quá khứ hoàn thành liên tục để diễn tả các hành động đã bắt đầu và tiếp tục trong một khoảng thời gian trước một sự kiện khác trong quá khứ.