Voice
His pocket has been picked.

They have his pocket picked
Picked has been his pocket.
Picking has been done to his pocket.
Someone has picked his pocket.

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Voice
James Watt discovered the energy of steam.

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

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Voice
The children could use the place always.

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

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