Answer:
1. Active voice: He may win the prize.
Passive voice: The prize may be won by him.
2. Active voice: The thief has been arrested.
Passive voice: Someone has arrested the thief.
3. Active voice: Robin has been punished by the teacher.
Passive voice: The teacher has punished Robin.
4. Active voice: The doctor was examining the patient when the light went off.
Passive voice: The patient was being examined by the doctor when the light went off.
5. Active voice: The children are being interviewed by the Principal for the school council.
Passive voice: The Principal is interviewing the children for the school council.
6. Active voice: They are painting the house.
Passive voice: The house is being painted by them.
7. Active voice: The school is celebrating its Annual Day.
Passive voice: The Annual Day is being celebrated by the school.
8. Active voice: My pocket has been picked.
Passive voice: Someone has picked my pocket.
9. Active voice: Do you know him?
Passive voice: Is he known by you?
10. Active voice: Eesha answered all the questions easily.
Passive voice: All the questions were answered easily by Eesha.
11. Active voice: This song has been sung by Lata.
Passive voice: Lata has sung this song.
12. Active voice: You cannot park this car here.
Passive voice: This car cannot be parked here by you.
Please note that the passive voice constructions may vary based on the context and the intended emphasis. The examples provided above are some possible ways to change the sentences into the passive voice, but there can be other correct variations as well.
Step-by-step explanation: