When there isn't a runner behind them forcing them to run. For example, if a runner is on 2nd base but there is no one on 1st base, the runner must be tagged on their way to 3rd in order to get them out. However, if there IS a runner on 1st, the 3rd baseman can simply touch the base because it is a force out.
the base fielder cant catch
You can tag a runner anytime but it's most important to tag a runner when it's not a force out play. When a baserunner runs to the next base without a runner behind him he must be tagged out before reaching base.
Not sure about all six, but the batter can be out if (s)he bunts foul on strike two (this is actually a strikeout), steps on the plate while bunting the ball, steps on the plate while hitting the ball, hits the ball when it is determined that the batter is out of the batter's box, touches the ball in fair territory with the body while out of the batters box, is hit by a throw to first from behind if not running in the outlined base running area between home and first, is hit by a pitch that is in the strike zone if (s)he intentionally positions a part of the body in a way that results in the ball hitting him/her.
In baseball? This is not allowed. The lead runner must attempt to advance to the next base; if it is tagged with the ball before the runner reaches it that runner is out.
not unless the bases are loaded, creating a force at home for the runner on third otherwise the runner must be tagged to be put out
It's called a force. The runner is being forced to proceed to the next base by the batter/runner.
Once the batter/runner is forced out at 1st base, the force out of all other base runners is no longer in effect. Therefore, even if the original runner at 1st falls, he must be tagged out. He could, in fact, return to first and be safe there if he is not tagged out.
It doesn't go by base-for force plays, you only have to touch the base. You tag the player on a steal, or when nobody is behind the player.
No, you can only overrun first base and home. Also, when overrunning first base, you must run in a straight line or you can be tagged out. If you make an "attempt" to go to second, you can be tagged out. Depending on the umpire, you must turn away from second to go back to the base.