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Football is a very popular sport around the world. It is played in almost every country. The basic rules of football are as follows：

1、 The field of play must be rectangular and marked with a center line and two goal lines at each end.

2、 The game is played between two teams of eleven players each.

3、 The team in possession of the ball attempts to move it up the field by passing and dribbling， while the opposing team attempts to stop them by tackling and intercepting passes.

4、 The team that scores the most goals by the end of the game wins.

5、 The game consists of two halves of 45 minutes each， with a 15-minute break in between.

6、 Substitutions are allowed only during the break.

7、 The ball must be kicked with the foot， not the hand.

8、 A goal is scored when the ball passes over the goal line between the goal posts.

9、 The goalkeeper is the only player allowed to touch the ball with their hands.

10、 Fouls are penalized with either a free kick or a penalty kick.

These are just some of the basic rules of football. As with any sport， there are more specific rules and regulations that vary from league to league.