Помогите с этим адски сложным упражнениеи

1. When Emmy got home, her brothers had already prepared their homework.

2. When Margaret had written a letter, she went to the post office.

3. When you arrived, he had already left home.

4. When noise had stopped, Dick played the piano.

5. When Lucy had read the telegram, she put it into her bag.

6. When the students had passed their examinations, they went to the cinema.