Voice
The invigilator was reading out the instructions.

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

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Voice
I don't know his whereabouts.

No one knows his whereabouts.
His whereabouts are not known to me.
His whereabouts is not known by me.
His whereabouts had not been known to me.

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Voice
Our colleague was given a gift when she retired.

A gift was given to our colleage when she retired.
Our colleague was given us a gift when she retired
Our colleague gave us a gift when she retired.
We gave our colleague a gift when she retired.

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

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Voice
We must take care of all living species on earth.

All living species on earth must be taken care of by us.
All living species on earth will be taken care of by us.
All living species on earth must taken care of by us.
All living species on Earth had been taken care of by us.

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