Voice
One must keep one's promises.

Ones promises must kept.
One's promises must be kept.
One's promises are kept.
Ones promises were kept.

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Voice
Alexander expected to conquer the world.

It was expected by Alexander that he will conquer the world.
It had been expected by Alexander that he would conquer the world.
It was expected by Alexander that he should conquer the world.
It was expected by Alexander that he would conquer the world.

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Voice
RAJAT WRITES A LETTER.

A letter wrote by Rajat.
A letter is to be written by Rajat.
A letter was to be written by Rajat.
A letter is written by Rajat.

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Voice
I don't know his whereabouts.

No one knows his whereabouts.
His whereabouts had not been known to me.
His whereabouts is not known by me.
His whereabouts are not known to me.

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