if the ball goes out, raise the flag and direct which team the ball belongs to. if a player is offsides, raise the flags and point to the spot. a center ref may consult with a linseman on a decision. on a substitution, hold the flag sideways indicating a stoppage of play.
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To become a linesman or assistant referee, you must go through a refereeing class. You will learn all the rules and be trained as both a center and assistant referee. The classshould be run by your countrie's soccer association.