Voice
The teacher punished the boys who had not done their homework.

The boys who had not done their homework had been punished by their teacher.
The boys who had not done their homework were punished by the teacher.
The boys were punished by their teacher who had not done their homework.
The boys who had not done their homework were being punished by the teacher.

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Voice
The manager could not accept the union leader's proposals.

The union leader's proposals would not be accepted by the manager.
The union leader's proposals could not be accepted by the manager.
The union leader's proposals were not accepted by the manager.
The union leader's proposals will not be accepted by the manager.

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Voice
Rita rescued three puppies.

Three puppies will be rescued by Rita.
Three puppies are rescued by Rita.
Three puppies are being rescued by Rita.
Three puppies were rescued by Rita.

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