A view from the ground of a footbridge , with several pedestrians on it , and the view of one man 's feet in the center foreground .
It is certain that the footbridge has a number of pedestrians walking on it .
It is certain that the footbridge has a number of pedestrians walking on it .
We doubt that the footbridge has a number of pedestrians walking on it .
The footbridge has a number of pedestrians walking on it .