Change the sentences into passive voice

IV. Change the sentences into passive voice. “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 ……………………………………………………….

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