Вопрос по английскому языку:

Преобразуйте в пассивный залог Past Simple:
Example: My sister wrote a letter. – A letter was written by my sister. (Past Simple)

1. I wore my black suit.
2. My mother left bags in the hall.
3. They built thousands of new houses.
4. Our friends sent the letter.
5. Children answered the questions.
6. The hairdresser washed my hair.
7. I bought a pair of jeans.
Помогите!