to participate in the contest
¿Vas a participar en el concurso?
Are you going to participate in the contest?
¿Van a participar en el concurso?
Are you going to take part in the competition?
Contestó tarde al correo y perdió la oportunidad de participar en el concurso.
She replied to the email late and missed the opportunity to participate in the contest.
Él quiere participar en el concurso.
He wants to participate in the contest.