Answer:
1. My father can repair your can.
Your can could be repaired by my father.
2. Josh has taken the kids to school.
The kids were taken to school by Josh.
My sister will buy the tickets.
The tickets will be bought by my sister.
4. I would have locked the door if I had the key.
The door would have been locked by the key if I had it.
5. Lee is feeding the cat.
The cat is being fed by Lee.
