Voice
He was congratulated by his teacher on his brilliant success in the recent examination.

His teacher congratulated him on his brilliant success in the examination.
His teacher congratulated him.
His teacher congratulated him for his brilliant success in the recent examination.
He congratulated his teacher on his brilliant success in the examination.

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Voice
James Watt discovered the energy of steam.

The energy of steam was discovered by James Watt.
James Watt had discovered energy by the steam.
The energy of steam discovered James Watt.
James Watt was discovered by the energy of steam.

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Voice
I don't know his whereabouts.

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

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Voice
The boy laughed at the lame man.

The lame man was laughed at by the boy.
The lame man was laughed by the boy.
The boy laughed when he saw the lame man.
The boy laughed seeing the lame man.

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Voice
The board selects the members.

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

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