1The referee blew the whistle to signal the start of the game.
2She has been a referee for several years and has officiated at many international matches.
3The players were unhappy with the referee's decision to award a penalty kick to the opposing team.
4If you want to become a referee, you need to complete a training course and pass an exam.
5The referee's impartiality is crucial to ensuring a fair outcome in any sporting competition.