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

6 After my sister had considered what to say , she decided to talk to her headmaster

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

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

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

5.We worked very hard for the exam.Then we passed it.

-->Before we passed the exam, we had worked very hard for it

6.First my sister considered what to say.Then she decided to talk to her headmaster.

-->After my sister had considered what to say, she decided to talk about her headmaster

7.I learned my lessons.Then I went out for a walk

-->Before I went out for a walk, I had learned my lessons

8.Her brother bought a new washing machine.First he checked the price

-->After her brother had checked the price, he bought a new washing machine 

9.My mother took an aspirin.Then she felt a little better.

-->Before my mother felt a little better, she had taken an aspirin