1. While I was watching a football match, he came.

2. When Martin arrived home, Anna was making dinner.

3. Mary was reading the boy's letter when he walked into the room.

4. He is always coming to class late.

5. My brother is interested in playing computer every day.

1. When he came, I was watching a football match.

=> While I was watching a football match, he came.

2. While Anna was making dinner, Martin arrived home.

=> When Martin arrived home, Anna was making dinner.

3. The boy walked into the room while Mary was reading his letter.

=> Mary was reading the boy's letter when he walked into the room.

4.He keeps coming to class late.

=> He is always coming to class late. ( câu phàn nàn )

5.My brother plays computer a lot every day.

=>My brother is interested in playing the computer every day.