Present participle; Past participle - refereeing - refereed Present - referee - referee - referees - referee - referee - referee Past - refereed - refereed - refereed - refereed - refereed - refereed Future - will referee - will referee - will referee - will referee - will referee - will referee Present conditional - would referee - would referee - would referee - would referee - would referee - would referee Present Perfect - have refereed - have refereed - has refereed - have refereed - have refereed - have refereed Past Perfect - had refereed - had refereed - had refereed - had refereed - had refereed - had refereed Future Perfect - will have refereed - will have refereed - will have refereed - will have refereed - will have refereed - will have refereed Past conditional - would have refereed - would have refereed - would have refereed - would have refereed - would have refereed - would have refereed Imperative - - - referee - - - - - - - -