Three workers are working on a metal roof
It is impossible that the workers are repairing a metal roof that was damaged when a branch fell on it .
There is a better than even chance that the workers are repairing a metal roof that was damaged when a branch fell on it .
It is impossible that the workers are repairing a metal roof that was damaged when a branch fell on it .
The workers are repairing a metal roof that was damaged when a branch fell on it .