Voice
They have not submitted their classwork regularly.

The class work has not been submitted regularly by them.
The classwork have not been submitted regularly by them.
The class work is not being submitted regularly by them.
The class work are not being submitted regularly.

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Voice
It was imagined by some of them that they would inevitably run out of cash.

They imagined that they would not have an immense supply of cash with them.
They imagined that they would run out of cash.
Some of them imagined that they would inevitably run out of cash.
They imagined that they would inevitably run out of cash.

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Voice
The boy killed the snake with a stick.

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

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