Voice
A letter has been written by me.

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

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

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

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Voice
In the following question, a sentence has been given in Active/Passive Voice. Out of the four/five alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. I don't know his whereabouts.

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

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Voice
Do not inform the police about the robbery.

Let the police be informed about the robbery.
The police do not be informed about the robbery.
The police need to be informed by the robbery.
Let not the police be informed about the robbery.

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