Voice
Somebody should have cleaned the windows yesterday.

The windows were not cleaned yesterday.
The windows should be cleaned yesterday.
The windows should have been cleaned yesterday.
The windows had to be cleaned yesterday.

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Voice
The Government is building new bridges.

New bridges are being built by the government.
New bridges have been built by the government.
New bridges are building by the government.
New bridges were built by the government.

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Voice
Everyone must read this book.

This book must be read by everyone.
This book is to be read by everyone.
This book has to be red by everyone.
This book should be read by everyone.

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Voice
Boil the water and cool it before you keep it in the fridge.

Let the water be boiled and cooled before it is kept in the fridge.
Let the water be boiled, cooled and kept in the fridge.
Let the water be boiled by you and cooled by you before it is kept in the fridge.
Let the water be boiled and cooled before it is kept in the fridge by you.

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