Voice
You need to clean your shoes properly.

You are needed to clean your shoes properly.
Your shoes are needed to clean properly.
Your shoes are needed by you to clean properly.
Your shoes need to be cleaned properly.

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Voice
You must look into this matter.

This matter has been looked into by you.
This matter into looked by you.
This matter may be looked into by you.
This matter should be looked into by you.

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

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

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Voice
They have spotted me in the crowd.

I would have been spotted by them in the crowd.
I will have been spotted by them in the crowd.
I am spotted by them in the crowd.
I have been spotted by them in the crowd.

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