Astronomers study the stars and the planets.
The stars and the planets are studied by astronomers.
They downloaded the game very quickly.
The game was downloaded very quickly.
They don't sell this phone model anymore.
This phone model is not sold anymore.
They hacked both my email accounts a few days ago.
Both my email accounts were hacked a few days ago.
A thief has stolen their car.
Their car has been stolen by a thief.
This company will not produce driverless cars in the future.
Driverless cars will not be produced by this company in the future.
We will make a cake for his birthday party.
A cake will be made by us for his birthday party.
Fortunately, he restarted the computer with no problem.
The computer was restarted with no problem.
Have they carried out the experiment yet?
Has the experiment been carried out yet?
In the museum, visitors use headphones to listen to the audio guide.
In the museum, headphones are used by visitors to listen to the audio.
An anti-virus program removes computer viruses.
Computer viruses are removed by an anti virus program.
I will buy a new photocopier next year.
A new photocopier will be bought next year.
We create a new folder for every subject.
A new folder is created for every subject.