1. She __________ (watch) TV when the power went out.

  2. They __________ (study) for hours before they finally took a break.

  3. I __________ (walk) in the park when I saw a rare bird.

  4. We __________ (not/sleep) well last night because of the storm.

  5. He __________ (work) in the garden all day when he suddenly felt sick.

  6. They __________ (play) video games for hours before their parents came home.

  7. Before the concert started, the band __________ (practice) backstage for several weeks.

  8. She __________ (cook) dinner when her friend called.

  9. I __________ (drive) to work when I realized I left my phone at home.

  10. The children __________ (make) a lot of noise when the guests arrived.

  11. They __________ (not/attend) the meeting because they __________ (work) on an important project.

  12. By the time the movie began, we __________ (wait) in line for over an hour.

  13. She __________ (read) the book for a few days when she decided to watch the movie instead.

  14. The team __________ (train) for the competition since January when it was suddenly canceled.

  15. I __________ (think) about changing my job for months when a great opportunity appeared.

  16. They __________ (build) the house for a year when they had to stop due to funding issues.

  17. Before they moved in, the new homeowners __________ (paint) the walls for weeks.

  18. The students __________ (not/study) much before the exams started, which was why they were so nervous.

  19. He __________ (try) to fix the car himself for hours when he decided to call a mechanic.

  20. We __________ (plan) our vacation for several months when we had to cancel it.

Answers for Self-Checking:

  1. was watching (Past Continuous)

  2. had been studying (Past Perfect Continuous)

  3. was walking (Past Continuous)

  4. weren't sleeping (Past Continuous)

  5. had been working (Past Perfect Continuous)

  6. had been playing (Past Perfect Continuous)

  7. had been practicing (Past Perfect Continuous)

  8. was cooking (Past Continuous)

  9. was driving (Past Continuous)

  10. were making (Past Continuous)

  11. weren't attending ... were working (Past Continuous)

  12. had been waiting (Past Perfect Continuous)

  13. had been reading (Past Perfect Continuous)

  14. had been training (Past Perfect Continuous)

  15. had been thinking (Past Perfect Continuous)

  16. had been building (Past Perfect Continuous)

  17. had been painting (Past Perfect Continuous)

  18. hadn't been studying (Past Continuous)

  19. had been trying (Past Perfect Continuous)

  20. had been planning (Past Perfect Continuous)