If a player leaves the field during the normal course of play, they may continue to play the ball. Even as their body is off the field.
Leaving the field as a form of deception, dissent, or as an offside trap tactic is a cautionable offense.
When a player steps outside the white line they are out of bounds
When it completely exits the field across a goal line or touch line.
when it passes the marked lines on the field.
When any part of a player's body is touching the court outside the out-of-bounds line. However, it is only a turnover if the player has the ball.
there is a throw in on the sides on the oppositions side there is a goal kick or a corner and on your side a corner of a goal kick
In professional soccer when the ball goes outside of the lines it is out of bounds.
A ball girl in soccer would get the ball when it goes out of bounds and will give it to either the coach - referee and/or put it by the goal post out of bounds so that when a ball goes out again the goalie can just grab the ball that is by the post.
a step kick is where you punt the ball out of bounds
If his knee touches inbounds, he is considered tackled in the field of play, regardless if the the ball ends up out of bounds. The clock will continue to run