I think, we are being followed!
I think, someone is following us!
My absence was approved by my boss.
My boss approved my abscence.
A strange man was watching us.
We were being watched by a strange man.
We had been given the wrong tickets.
Somebody had given us the wrong tickets.
Someone could have informed her about the issue.
She could have been informed about the issue (by someone).
His mother had warned him about the danger long before it the accident happened.
He had been warned about the danger...
The police are investigating the case.
The case is being investigated (by the police).
They had already eaten all the cookies when I arrived.
All the cookies has already been eaten...
Heavy rain flooded the whole town last week.
The whole town was flooded last week.
He should improve his handwriting.
His handwriting should be improved.
They could not have made the mistake.
The mistake could not have been made by them.
Nobody has recorded this song yet. I have just finished composing it.
This song has not been recorded yet.
Someone must have given her the correct answers.
She must have been given the correct answers.
The thieves stole the precious statue from a highly protected safe.
The precious statue was stolen from a highly protected safe.
The new hospital is going to be opened tomorrow by the president.
The president is going to open the new hospital tomorrow.
She is going to give a speech on time management.
A speech on time management is going to be given...
They might make a donation.
A donation might be made (by them).
Yesterday, precisely at midnight, an unknown person was stealing our equipment.
...our equipment was being stolen (by an unknown person).
That email has to be sent by us, not them.
We have to send that email, not them.
Someone should have set the alarm.
The alarm should have been set (by someone).
We have finally completed the project!
The project has finally been completed!
The problem is currently being handled by our customer service team.
Our customer service team is currently handling the problem.
Companies will surely build many space hotels on the Moon in the upsoming years.
Many spae hotels will surely be build on the Moon.
Nobody was admitted to the hospital after the accident.
The hospital did not admit anybody after the accident.
A famous architect designed this bridge back in the 20th century.
This bridge was designed back in the 20th century by a famous architect.