This is a regular verb. It follows the conjugation pattern of the verb hablar.
PresentPresente
El vecino denuncia el ruido a la policía.
The neighbor reports the noise to the police.
PreteritePretérito indefinido
Denunciamos el robo de la bicicleta ayer.
We reported the bicycle theft yesterday.
FutureFuturo
Ella denunciará el problema al ayuntamiento.
She will report the problem to the city hall.