Passive

The rules may be forgotten quickly.

You may be forget the rules quickly.

The rules may be forgot quickly.

You should be studied the lessons repeatedly.

The lessons should be studied repeatedly.

The lessons should studied repeatedly.

Benjamin must be win the competition.

The competition must be won by Benjamin.

The competition must have been win by Benjamin.

The game should be cancelled.

They should be cancel the game.

The game should have be cancelled.

The doctor can't be persuaded her.

She can`t be persuaded by doctor.

She can`t been persuaded by doctor.

Who should be paid the damage?

Who should the damage be paid by?

Who should the damage been paid by?

Poor people can not be spent a lot of money.

A lot of money can not have been spent by poor people.

A lot of money can not be spent by poor people.

The police should have been called at once after the accident.

We should have been called the police at once after the accident.

The police should have be called at once after the accident.

We must be put an end to this quarrel.

An end to this quarrel must be put.

This quarrel must be an end.

A good job should have been done by the policeman.

A good job should have be done by the policeman.

The policeman should have been done a good job. 

is explored

is exploring

are explored

are exploring

are believed

believe

is believed

is interviewed

is being interviewed

has been interviewed