If the score has reached 6 points all, the players change ends and continue in the same pattern until on player establishes a margin of 2 points. Players change ends every 6 points. In doubles the same pattern is followed except the doubles partners alternate service turns for the team. Keep your own score. In doubt on call the shot is good.
Loose ball interferes call a let immediately.
Don't shout or distract opponent. It is immature to curse. Avoid walking behind a court during a point. Shake hands with opponent at the net after a match.