Steven has bought these flowers.
These flowers have been bought by Steven.
Mr. Delicious is cooking the dinner tonight.
The dinner is being cooked by Mr Delicious tonight.
No one has seen them for days
They haven't been seen for days
The president will introduce new changes soon
New changes will be introduced by the president soon
Someone has made a mistake
A mistake has been made (by someone)
Somebody has watered the plants.
The plants have been watered.
The earthquake in Pompei destroyed the whole city
The whole city was destroyed by the earthquake in Pompei
A burglar broke the windows
The windows were broken by the burglar.
Have they noticed us?
Have we been noticed by them?
Mary has just copied Tom's homework.
Tom's homework has just been copied by Mary.
An old woman feeds the pigeons
The pigeons are fed by an old woman.
They play the final on Wednesday
The final is played on Wednesday
Kerrie has paid the bill.
The bill has been paid by Kerrie.
Paula will drive the car next time
The car will be driven by Paula next time
Has she phoned him?
Has he been phoned by her?
A famous actor will open the new shopping centre
The new shopping centre will be opened by the famous actor
The top chef cooks all the meals here
All the meals are cooked by the top chef here
I have eaten tofu.
Tofu has been eaten by me.
They have not read the book.
The book hasn't been read by them.
Dan copied Jack's homework yesterday.
Jack's homework was copied by Dan yesterday.
Bill has read all these books.
All these books have been read by Bill.