Voice
The invigilator was reading out the instructions.

The instructions were read by the invigilator.
The instructions were being read out by the invigilator.
The instructions had been read out by the invigilator.
The instructions had been read by the invigilator.

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Voice
Children make a noise.

A noise is being made by the children.
Noise is made by children.
A noise was being made by the children.
A noise was made by the children.

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Voice
The Army chief punished his subordinate.

His subordinate is punished by the Army chief.
His subordinate was punished by the Army chief.
His subordinate was being punished by the Army chief.
His subordinate is being punished by the Army chief.

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Voice
This machine must not be used after 5.30 p.m.

You must not use the machine after 5.30 p.m.
You need not use the machine after 5.30 p.m.
You mayn't use the machine after 5.30 p.m.
You can't use the machine after 5.30 p.m.

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Voice
Each member of the academy was given a prize.

They give a prize to each member of the academy.
They gave a prize to each member of the academy.
Every member of the academy got a prize.
They are giving a prize to each member of the academy.

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