Voice
The boy laughed at the lame man.

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

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Voice
They held a meeting and delivered speeches.

A meeting was held and speeches were delivered.
A meeting was held and delivered speeches.
A meeting will be held and speeches delivered.
A meeting is held and speeches delivered.

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Voice
They say that the earth is round.

It has been said that the earth is round.
It is said that the earth is round.
That the earth is round is said by them.
It was said that the earth was round.

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

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