Change into passive voice 1. Keith was singing a favorite song 2. The postman delivers the letter by motorcyle 3. A servant was clearing the rooms before seven

1. A favourite song was being sung  by Keith.
2. The letter is delivered by motorcycle by the postman.
3. The room was being cleared by a servant before seven o'clock.
4. Many houses were destroyed by the storm last night.
5. The employee candidate is being interviewed by the assistant manager.