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Someone might have stolen the valuable jewels.
The valuable jewels might have been stolen.
The company normally delivers cars within a month.
Cars are normally delivered within a month.
Scientists have not tested the new product on humans.
The new product has not been tested on humans.
Everyone must wear hard hats when working on the building site.
Hard hats must be worn when working on the building site.
They are monitoring the whole area with TV cameras.
The whole area is being monitored with TV cameras.
They saw the suspect entering the building.
The suspect was seen entering the building.
The organizers will offer drinks during the break.
Drinks will be offered during the break (by the organizers).
The manager will report all shoplifters to the police.
All shoplifters will be reported to the police (by the manager).
You cannot trust politicians.
Politicians can't be trusted.
They were opening the parcel when I came in.
The parcel was being opened when I came in.
The judge shouldn't have postponed the hearing.
The hearing shouldn't have been postponed (by the judge).
The shop assistant offered a refund to the customer.
A refund was offered to the customer.
or
The customer was offered a refund.
Look! someone has broken the vase.
Look! The vase has been broken.
The police are investigating the murder.
The murder is being investigated by the police.
Candidates must write their answers in ink.
Answers must be written in ink (by the candidates)
They make all of the components in foreign factories.
All of the components are made in foreign factories.
Picasso painted Guernica in 1937.
Guernica was painted by Picasso in 1937
Nobody has done the washing up.
The washing up hasn't been done.
They have often described New York as the busiest city in the world.
New York has often been described as the busiest city in the world.
People have fought wars throughout history.
Wars have been fought throughout history.
Border officials made me open my suitcase.
I was made to open my suitcase by border officials.
My husband gave me a new cell phone for my birthday.
I was given a new cell phone for my birthday by my husband.
People say that the Copacabana is the most wonderful beach in the world.
The Copacabana is said to be the most wonderful beach in the world.
They will have told him the news by next week.
He will have been told the news by next week.
They said that he was innocent.
He was said to be innocent.