1. After having a bath, I went to bed

2. When reading the letter, threw it away.

3. He bought a car as soon as he passed his driving test.

4. When finishing reading the book, I took it back to the library.

5. I went to bed until I did my homework.

6. When spending all my money, I went home.

7. Before seeing the movie, I read the book

8. After her children left home, she started writing.

1. After I had had a bath, I went to bed. 

(After + past perfect, simple past: hành động xảy ra sau một hành động trong quá khứ) 

2. When I had read the letter I threw it away.

(When + simple past, past perfect:Hành động xảy ra trước một hành động trong quá khứ ( hành động ở mệnh đề when).) 

3. He bought a car as soon as he had passed his driving test.

4.I took the book back to the library when I had finished reading it.

5.I didn’t go to bed until I had done my homework.

6.When I had spent all my money,  I went home.

7.I had read the book before I saw the film. 

(Before +simple past, past perfect:hành động xảy ra trước một hành động trong quá khứ) 

8.She started writing after her children had left home. 

(After + past perfect, simple past:hành động xảy ra sau một hành động trong quá khứ)