1. Before we passed the exam, we had worked very hard for it.

2. After my sister had considered what to say, she talk to her headmaster.

3. Before I went out for a walk, I had learned my lessons.

4. After her brother had checked the prices, he bought a new washing machine.

5. Before my mother felt a little better, she had taken an aspirin.

6. After the boys had argued, they fought.

7. Before his aunt had an accident, she had gone out to a food store.

8. After we decided to go on a trip to Hue, we had had some problems.

9. Before the students wrote their assignments, they had read some materials.

10. After he had watched a football match, he wrote a report.

Bạn phải sửa lại như này nha.