Voice
Somebody should have cleaned the windows yesterday.

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

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Voice
A lion does not eat grass, however, hungry he may be.

Grass is eaten not by a lion, however hungry he may be.
Grass is being not eaten by a lion despite being hungry.
Grass is not eaten by a lion, however hungry he may be.
Grass is not being eaten by a lion, however hungry he may be.

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Voice
Who teaches you English?

By whom are you taught English?
English is taught by whom?
By whom were you taught English?
By whom will you be taught English?

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Voice
He will object to my proposal.

My proposal will be objected to by him.
The objection to my proposal will come from him.
His objection will be to my proposal.
There will be an objection to my proposal by him.

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Voice
He said, "I must go next week."

He said that he was to go the following week.
He said that he would have to go the following week.
He said that he must go next week.
He said that he must go the following week.

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