Тема The Passive Voice 1 Transfer into the present passive 1

1. They build new houses. New houses are built by them.
2. We change our address. Our address is changed.
3 We check mail every day. Mail is checked by us every day.
4. Musicians compose music. Music is composed by musicians.
5. Authors write books. Books are written by authors.
6. Students write test every month. Test is written by students every month.
7. They wash the window in spring. The windows are washed by them in spring.
8. They plant fruit trees in our garden. Fruit trees are planted by them in our garden.