Voice
The clown was being laughed at by them.

They laughed at the clown.
They were laughing at the clown.
They were laughing on the clown.
The clown was laughed at by them.

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Voice
James Watt discovered the energy of 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.
James Watt had discovered energy by the steam.

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