Voice
A letter has been written by me.

I has written a letter.
I had written a letter.
I have written a letter.
I have been writing a letter.

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Voice
The boy killed the snake with a stick.

A snake is killed by the boy with a stick.
The snake was killed by the boy with a stick.
A snake with stick was killed by the boy.
A stick was killed by the boys with a snake.

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Voice
The principal has granted him a scholarship.

A scholarship was granted to him by the principal.
He has been granted a scholarship by the Principal
He has granted a scholarship by the Principal.
A scholarship has granted to him by the principal.

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