The boy is jumping in the air .
The boy jumps in air to keep from stepping on a pebble .
The boy is jumping in the air.
The boy jumps in air to keep from stepping on a pebble.
The boy is playing tennis, and is clearly jumping to hit the ball, and not jumping in the air to keep from stepping on a pebble.
The boy is playing tennis , and is clearly jumping to hit the ball , and not jumping in the air to keep from stepping on a pebble .