Voice
The invigilator was reading out the instructions.

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

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Voice
Who is creating this mess?

Who has been created this mess?
By whom this mess is being created?
By whom is this mess being created?
By whom has this mess been created?

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Voice
You have to do this immediately.

This has to be done by you immediately.
This is being done by you immediately.
This is being done by you immediately.
This was being done by you immediately.

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Voice
The labourers were digging a canal.

A canal had been dug by the labourers.
A canal was being dug by the labourers.
A canal was dug by the labourers.
A canal is being digged by the labourers.

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Voice
Tiny houses dot the landscape.

The landscape is being dotted by tiny houses.
The landscape is dotted by tiny houses.
The landscape has been dotted by tiny houses.
The landscape was dotted by tiny houses.

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