A player is considered offside when they are in front of the last defender at the moment the ball is played to them. This offside rule is designed to prevent players from gaining an unfair advantage by positioning themselves too close to the opponent's goal without the active involvement of defenders. The presence of at least one defender on the player's side of the ball is crucial in determining if offside is being violated. In soccer, the player does not have to be ahead of the ball at all times (as suggested by the first option), since they can be onside even if they are forward at certain moments, provided they are not beyond the last defender when the ball is played. Being behind the goal line at the moment the ball is kicked (the third option) has no bearing on the offside rule; it mainly concerns the position of the player relative to the last defender and the ball. Lastly, a player in active play without a defender nearby (the fourth option) does not reflect the criteria for offside, as offside is strictly about player positioning relative to defenders at the time the ball is played.

A goal is considered valid when the entire ball crosses the goal line between the goalposts and under the crossbar. This means that for a goal to be counted, there should be no part of the ball still touching or above the line; it must fully cross into the goal area. This clear and specific requirement ensures that there is no ambiguity regarding whether a goal has been scored, thereby maintaining fairness in the game. The other conditions, while important to the overall rules and flow of the game, do not affect the validity of a goal. For example, the ball does not need to hit the crossbar, and it can be scored from various positions on the field, not only from the penalty area. Additionally, while goals must be scored within regulation time for them to count, this does not relate to the actual criteria for what constitutes a goal itself.

In soccer, when a player receives a second yellow card during a match, the established protocol dictates that the player is shown a red card and sent off. This is part of the disciplinary system designed to maintain fairness and order during the game. The first yellow card serves as a warning for misconduct, and if the same player commits another infraction worthy of a yellow card, the referee must respond by issuing a second yellow. This cumulative nature of the yellow card system reinforces the expectation of discipline on the field. Once a player is shown a red card, they must leave the field and cannot be replaced, leaving their team with one less player for the remainder of the match. This serves not only as a punishment for the player involved but also as a deterrent for others to avoid repeated offenses.

If a soccer match is abandoned before completion, the situation is typically handled according to the specific rules of the competition governing that match. In many cases, the match may indeed be replayed, especially if the abandonment occurred due to a circumstance that prevents a fair conclusion, such as inclement weather, crowd disturbances, or other unforeseen events. The rules will dictate whether a replay is necessary based on the timing of the abandonment, the score at the time, and the importance of the match. For instance, if the first half is completed but the second half is not, some competitions may choose to replay the match entirely, while others might simply restart from the score at the time of abandonment. The key takeaway is that the decision on whether the match is replayed is dependent on the specific regulations set forth by the competition organizers, confirming that this choice aligns best with the governance of the sport.