Change the sentences into passive

IV. Change the sentences into passive. “S + can / must / used to / have to… + be + Vpp…. by O”

1. We should clean our teeth twice a day. g ……………………………………………

2. People must not leave bicycles in the hall. g ……………………………………………

3. I can buy this house. g ………………………………………

4. Sam ought to clean his room. g ……………………………………………

5. Sam can bring it back this morning. g ……………………………………………………….

6. They have to repair the machine. g ……………………………………………………….

7. We must bake the bread soon. g ……………………………………………………….

8. He will have to finish this work before 9.00 g ………………………………