Voice
The clown was being laughed at by them.

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

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Voice
The watchman switched on the lights before it began to grow dark.

The lights were only switched on before it began to grow dark.
The lights were switched on by the watchman before it began to grow dark.
The lights are being switched on before it began to grow dark.
The lights were being switched on by the watchman before it began to grow dark.

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