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1. Their car stopped because they hadn't bought any petrol.

2. Kate had a shower after she had played football.

3. Jack bought a new cellphone because he had lost his cellphone.

4. His dad shouted at him because he had broken the TV set.

5. The plants died because we had forgotten to water them/the plants.

6. I left the house after I had locked the front door.

QKHT -> hành động xảy ra trước hành động khác trong quá khứ