1
The ball will bounce high.
Sign 'ball', then use the sign for 'bounce'. To show that the bounce is particularly high, you can exaggerate the upward arc of your dominant hand, bringing it higher than usual to visually demonstrate the height.
2
Watch the ball bounce down the stairs.
After signing 'ball', you can modify the 'bounce' sign to show direction. Instead of one big arc, make multiple smaller, descending arcs moving downward and away from you to visually represent the ball bouncing down a flight of steps.
3
Don't bounce the ball in the house.
Sign 'house' and 'not', then sign 'bounce'. When signing 'bounce' in a negative command like this, use a firm, clear movement and a serious facial expression to emphasize that bouncing the ball indoors is against the rules.