passive & active practice

The active voice and the passive voice

All the people in the world admire Kennedy
-> Kennedy is admired by all the people in the world
Jack builds the house
-> The house was built by Jack
Jack built the house
->The house was built by Jack
Jack will build the house
-> The house will be built by Jack
Jack has built the house
-> The house has been built by Jack
Jack had built the house
-> The house had been built by Jack
Jack will have built the house
-> The house will have been built by Jack
Jack is building the house
-> The house is being built by Jack
Jack can build the house
-> The house can be built by Jack
Henry gave me these books
-> I was given these books by Henry
-> These books were given to me by Henry
They elected Kennedy President
-> Kennedy was elected president
We saw him enter the room
-> He was seen to enter the room
Who invented this machine?
-> By whom was this machine invented?