The traffic might have delayed Jimmy.
Jimmy might have been delayed bu the traffic
A workman will repair the computer tomorrow.
The computer will be repaired tomorrow (by a workman)
He had written three books before 1867.
Three books had been written by him before 1897.
Somebody has drunk all the milk!
All the milk has been drunk!
The Government is planning a new road near my house.
A new road is being planned near my house by the government.
The cleaner has cleaned the office.
The office has been cleaned (by the cleaner)
Picasso was painting Guernica at that time.
Guenica was being painted (by Picasso) at that time.
By this time tomorrow we will have signed the deal.
By this time tomorrow the deal will have been signed by us.
Somebody should do the work.
The work should be done (by someone)
My grandfather built this house in 1943.
This house was built in 1943 by my grandfather / This house was built by my grandfather in 1943