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Mike is smoking a cigarette next to flammable material.
There be an explosion.
He stop smoking.

Alex is not wearing goggles.
He hurt his eyes.
He put goggles on.

Helen took the guard off the machine.
She do that.
Someone get hurt.

John's carrying three boxes.
He carry the boxes one by one.
He bump into someone.

The floor is wet and Mike didn't put up the warning sign.
Someone slip.
Someone clean it up.
Mike forget to put up the warning sign.