Chuyển những câu sau sang câu bị động

1, I can buy this house
2, sam ought to clean his room
3, we will shut the door
4, nina shall call you as soon as the arrives
5, sam can bring it back this morning
6, they will pass their exam
7, henry ought to leave a message on the table for me
8, vicky can pay her bill next week
9, you should clean the windows
10, you will phone me later