Voice
The clown was being laughed at by them.

They laughed at the clown.
The clown was laughed at by them.
They were laughing at the clown.
They were laughing on the clown.

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Voice
The government has not approved the new drug for sale.

The government approval for the sale of the new drug has not been given.
For the sale of the new drug we have not been given the approval.
The new drug has not been approved for sale by the government.
The new drug was not approved by the government.

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Voice
A great man acknowledged me as a flatterer to him.

I was acknowledged as a flatterer to a great man.
I am acknowledged as a flatterer by a great man.
I was acknowledged by a great man to be a flatterer.
I was acknowledged by a great man to have been a flatterer.

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