IV.  Put the following into the passive voice. Do not mention the agent unless it seems necessary.

This dress can’t be washed; it must be dry-cleaned.

__________________________________________________________________________

The wine should be opened about three hours before it is used.

__________________________________________________________________________

Books may be kept for three weeks. After that they must be returned.

__________________________________________________________________________

These calculations used to be done with slide rules; now it is done by a computer.

__________________________________________________________________________

Tickets shouldn’t be thrown away as they may be checked during the journey.

__________________________________________________________________________

The car will have to be towed to the garage.

__________________________________________________________________________

Umbrellas and sticks must be left in the cloakroom.

__________________________________________________________________________

You should have taken those books back to the library.

__________________________________________________________________________

We cannot exchange articles which customers have bought during the sale.

__________________________________________________________________________

You mustn’t move this man; he is too ill. You’ll have to leave him here.

__________________________________________________________________________

When they have widened this street, the roar of the traffic will keep residents awake all night.

__________________________________________________________________________

You will have to pull down this skyscraper as you have not complied with the town planning regulations.

__________________________________________________________________________

They ought to have reported the accident to the police.

__________________________________________________________________________

He recommends fitting new tires.

__________________________________________________________________________

He suggested allowing council tenants to buy their houses.

__________________________________________________________________________