Dưới đây là các động từ được chia ở thì Quá khứ đơn, Quá khứ tiếp diễn và Quá khứ hoàn thành:

1. When the police **arrived** the car **went**.
2. While we **were doing** a sight-seeing tour, our friends **were lying** on the beach.
3. They **had eaten** everything by the time they **arrived** at the party.
4. While Tom **was playing** the piano, his mother **was doing** the washing-up.
5. I **went** after they **had finished** their work.
6. The light **went out** while I **was having** dinner.
7. He **did** nothing before he **saw** me.
8. When they **reached** the station, the train **had left**.
9. The house **caught** fire while they **were sleeping**.
10. While Tom **was reading**, Amely **was watching** a documentary on TV.
11. The burglar **opened** the safe when he **heard** footsteps. He immediately **put** out his torch and **crawled** under the bed.
12. Last night, I **dropped** a plate when I **was doing** the washing-up.
13. Fortunately, it **didn't break**.
14. Mary and I **danced** the house when the telephone rang.
15. The boy fell and hurt himself while he **was riding** a bicycle.

Nếu cần thêm trợ giúp, vui lòng cho tôi biết!