Can the football defense grasp the mask the above are the most common fouls

The foul system in football, please, 3Q
The above are the most common fouls. Generally, forward yards or backward yards of 5-10 yards will be obtained. In serious cases, a penalty of 15 yards will be awarded for rugby. Defensive players cannot defend with parts higher than the chest of offensive players. You can hug your waistFootball rules
Each detachment consists of three types of players: the attack group, which is responsible for the attack; Defense team, responsible for defense; Special team, responsible for special situations - kick-off, shot and kick-off. In any case, one side can only have 11 players on the court. The clothes of American football players are as colorful as the playing field. [kickoff]How should football be defended
The most important principles of rugby defense are counterpoint defense and the principle of having the ball forced and not having the ball loose. In defense, it is required that the defenders stand in a straight line and keep a good distance between each other. The opponent must not form a situation of playing more and playing less locally. According to the defensive ability of their own players and the offensive ability of the opposing players, it is necessary to ensure that theWhat are the rules of football
Offensive method offensive formation the offensive method of American football is similar to that of six man football. The team holding the ball (the offensive side) has four offensive opportunities to advance ten yards forward (the arrival area of the defensive side). Each opportunity is called a " Gear " (down)。 When the attacking side successfully advances ten yards (or more) in the fourth gear, it can again obtain the fourth gear to continue the attackExercise value of football
Football is a collision sport. In order to stop the attacker from pushing forward, the defender must grasp the opponent who intercepts and holds the ball. Therefore, the defensive team members will stop the opponent through physical contact when the ball meets the rules. The ball rule states that the defending catcher cannot kick, hit or trip the opponent. Defense can not pull the other side's maskWhat are the rules for football and ice hockey
The goalkeeper is the last line of defense. He can use the club to control the ball, grasp the ball, throw the ball, throw the ball, kick the ball, and break the ball with his body or club. So the goalkeeper is heavily equipped and has a club bigger than anyone else. He must also wear a mask for further protectionAmerican football problem
The offensive method of American football is similar to that of six man football. The team holding the ball (the offensive side) has four offensive opportunities to advance ten yards forward (the defensive side's arrival area). Each opportunity is called a down. When the attacking side successfully advances ten yards in four times, it can get four more chances to continue the attackThe rules of football (tried in America)
The goal of the defensive side is to prevent the other side from scoring as much as possible and force it to lose the ball right out of control. If one of the attacking teams succeeds in scoring or loses the ball right out of control, the teams of both sides exchange attack and defense, and the game will go on in turn until the end of the four-quarter game. 2) Game time: the standard American football game is divided into four sections, each of which is 15 minutes, and the thirdHow to catch football
The defender shall not pull the mask of the opponent, use his own helmet to intercept, or pick up the opponent and then fall. In addition to these and other rules on "excessively rough" interception, other methods of grappling are considered legalWhat is a football foul
Football fouls are judged from two aspects. First, the defender's fouls. If the defender accepts the penalty, he can hit the ground and start again; The second is the offense of the offensive side. Generally, the offense of the offensive side is that the touchdown is not repeated, that is, the touchdown is invalid. There are also some conventional fouls, both sides can not pull the other side's mask