has been refereeing
-ha estado arbitrando
Presente perfecto progresivo para el sujeto he/she del verbo referee.

referee

Participants Quintin Ramsey has been refereeing youth soccer games and hopes to add volleyball to the list.
Quintin Ramsey ha sido arbitro de fútbol juvenil, y espera añadir a su lista el voleibol.
Laura has been refereeing for five years in the Spanish basketball league.
Laura lleva cinco años arbitrando en la liga de baloncesto española.
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