There ought to be a clear shot across the roof.

The old man raced across the roof of the next building.

He turned his head on one side and looked across the roof.

Moving across the roof, he looked down and saw a van, with several men standing next to it.

He went on across the roof, following the line of the bearing wall.

He turned and led them across the roof to a waiting elevator.

He walked across the roof to the back wall and looked over the edge.

Okay, now you just have to walk across the roof without making any noise.

He had been in the house when the fire started, neighbors said, and ran out across the roof for help.

I turned and saw three dead men running toward me across the roof.