Use Passive voice:
1. Paul (send) to prison. (Future tense)
2. My brother (just beat) in the race. (Present perfect)
3. He (tell) to wait outside. (Past tense)
4. I (not pay) for the work. (Past tense)
5. Policemen (often ask) the way. (Present tense)
6. Their lawn (cut) once a week. (Present tense)
7. We (ask) by the police. (Future tense)
8. The towels (not use). (Past tense)
9. He (not sell) the jewels. (Present perfect)
10. They (teach) French. (Present tense)
11. The fire brigade (phone) soon after the fire had broken out. (Past tense)
12. You (laugh) at if you talk such nonsense. (Future tense)
13. All the fruits (eat up) by the guests. (Past tense)
14. The letter (answer) tomorrow. (Future tense)
15. Stamps (sell) here. (Present tense)