You mean football?
They have to watch for fouls, award cards for fouls (2 yellows make a red, although a straight red card can be awarded), signal for an offside - they are helped by 2 linesman for this role- and thet're the main ones I think!
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The responsibility of referee and assistant referee in football is to officiate the game. They are tasked with the duty of ensuring that there is fair play and they are the judges of the game.
They are linesmen, watching for the ball going out. They watch for players going offside. They can advise the referee on incidents when the referee needs some help or didn't see an incident clearly. They may directly intervene in a incident, like when two players start fighting.
The duties of the assistant referee are discribed in Law 6 of the FIFA Laws of the Game. Basically, the Assistant Referee is there to help the Referee
The duties of an assistant referee are explained in Law 6 of the FIFA Laws of the Game. Basically, Assistant Referees are there to help the Referee.
The assistant checks whether the goalkeeper is on his line or not, as well as making sure the players stay outside the box before the player kicks the ball.
He is an official who watches a game or match closely to ensure that the rules are adhered to and to arbitrate on matters arising from the play