Voice
The boy laughed at the beggar.

The beggar was being laughed by the boy.
The beggar was laughed by the boy.
The beggar was laughed at by the boy.
The beggar was being laughed at by the boy.

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Voice
I cannot draw this picture.

This picture cannot be drawn by I.
This picture could not be drawn by me.
This picture could not be drawn by I.
This picture cannot be drawn by me.

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Voice
Deforestation has reduced rainfall in the tropical lands.

Reduced rainfall deforested.
Rainfall has been reduced and caused deforestation.
Rainfall has been reduced in the tropical lands due to deforestation.
Tropical lands have been reduced by rainfall.

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