A
The teacher helps the students.
The students are helped (by the teacher).
My mom bakes a cake every Sunday.
A cake is baked (by my mom) every Sunday.
They clean the classroom.
The classroom is cleaned (by them).
The police caught the thief yesterday.
The thief was caught (by the police) yesterday.
She will finish the project tomorrow.
The project will be finished (by her) tomorrow.
The mechanic is repairing the car.
The car is being repaired (by the mechanic.)
The company has built a new bridge across the river.
A new bridge has been built across the river (by the company.)
People believe that he stole the money.
He is believed to have stolen the money.
Someone should have told me the truth.
I should have been told the truth.