The passive voice

1. Someone broke his windows last night.
2. The police didn’t find the lost boy yesterday. 
3. Jack has typed the article recently. 
4. The police haven’t found the murderer yet.
5. Nobody has used this room for ages.
6. Paul didn’t tell me the ending of the story.  
7. Her mother bought her a doll last week.
8. The police found the robber in the forest yesterday.
9. People saw him steal your car.
10. I have heard her sing this song several times.