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
Big Cars must be driven very carefully.

Drivers are driving big cars carefully.
Drivers drive big cars very carefully.
Drivers have to drive big cars carefully.
Drivers must drive big cars very carefully.

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Voice
Their dog bit our neighbor yesterday.

Our neighbor were bit by their dog yesterday.
Our neighbor bit their dog yesterday.
Our neighbor was bitten by their dog yesterday.
Our neighbor bitten by their dog yesterday.

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Voice
They held a meeting and delivered speeches.

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

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