Nobody has made any mistakes.
No mistakes have been made
Two of my dinner plates (break). -present perfect
Two of my dinner plates have been broken (break). -present perfect
Somebody must have taken it while I was out.
It must have been taken away while I was out
They treated us to some ice-ceam.
We were treated to some ice-cream
Somebody will meet the visitors at the station.
The visitors will be met at the station
They turned my offer down.
My offer was turned down
No one can answer your question.
Your question cannot be answered by anyone
Somebody will meet the visitors at the station.
The visitors will be met at the station
We'll have to examine you again.
You will have to be examined again
People say tortoises live longer than elephants. (Tortoises...)
Tortoises are said to live longer than elephants
He's so good at golf nobody can beat him.
He is so good (that) he can't be beaten at golf
Poverty drove him to desperation.
He was driven to desperation by poverty
They will give you the answer next week.
You will be given the answer next week
Has someone repaired that chair yet?
Has that chair been repaired yet?
I have sharpened the knives.
The knives have been sharpened (by me)
I hate people looking at me.
I hate being looked at (by people)
