Voice
Why didn't you invite him for the party?

Why didn't he invited by you for the party?
Why couldn't he be invited by you for the party?
Why he not invited by you for the party?
Why was he not invited by you for the party?

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Voice
The labourers were digging a canal.

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

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Voice
The children could use the place always.

The place can be used by children.
The place is used by children always.
The place could always be used by the children.
The place has been used by children always.

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Voice
James Watt discovered the energy of steam.

James Watt was discovered by the energy of steam.
The energy of steam discovered James Watt.
James Watt had discovered energy by the steam.
The energy of steam was discovered by James Watt.

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