Voice
His pocket has been picked.

Picking has been done to his pocket.
They have his pocket picked
Picked has been his pocket.
Someone has picked his pocket.

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Voice
The boy killed the snake with a stick.

A snake is killed by the boy with a stick.
A snake with stick was killed by the boy.
The snake was killed by the boy with a stick.
A stick was killed by the boys with a snake.

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Voice
After driving professor Kumar to the museum she dropped him at his hotel.

After being driven to the museum, Professor Kumar was dropped at his hotel.
After she was driven Professor Kumar to the museum she had dropped him at his hotel.
After she had driven Professor Kumar to the museum she had dropped him at his hotel.
Professor Kumar was being driven dropped at his hotel.

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