Voice
Who teaches you English?

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

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Voice
Das has posted the letter.

The letter was posted by Das.
The letter had been posted by Das.
The letter have been posted by Das.
The letter has been posted by Das.

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Voice
The board selects the members.

The members are selected by the board.
The members were selected by the board.
The members are being selected by the board.
The members shall be selected by the board.

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