As soon as a golfer has taken their first shot of the tee, the ball is in play. It is in play until it is holed, apart from when it is lifted, lost, substituted in agreement with the rules or if it is out of bounds.
The ball is in play once the player starts his downswing in the teeing area. It continues to be so until holed out, lost, out of bounds or lifted.
The ball remains in play until it's holed, unless lost, lifted or out of bounds or another ball has been substituted in play. The substituted ball then becomes the ball in play.
A ball is in play as soon as the player has made a stroke in the tee off area. It remains in play until it is holed out except when it is out of bounds, lost, lifted or when another ball is substituted in accordance with the rules.
A golf ball is in play after the player has begun his downswing in the tee off area. It will remain in play until holed, hit out of bounds, lost, or lifted.
A ball is "in play" as soon as the player has made a stroke on the teeing ground. It remains in play until holed out, except when it is lost, out of bounds or lifted, or another ball has been substituted whether or not such substitution is permitted; a ball so substituted becomes the ball in play.