Voice
James Watt discovered the energy of steam.

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

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Voice
The peon refused him admittance.

Admittance is refused him by the peon.
Admittance is refused to him by the peon.
He was refused admittance by the peon.
Admittance was refused by the peon to him.

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Voice
The children could use the place always.

The place can be used by children.
The place is used by children always.
The place has been used by children always.
The place could always be used by the children.

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