To form the Present Perfect and the Pluperfect/ Past Perfect tenses in Spanish the verb “HABER” is used in the present and the imperfect tenses respectively in addition to a past participle. Before addressing the conjugations of the verb “HABER” we will look at forming the past participle.
2.Comer = Comido
3.Vivir = Vivido
1.Traer = Tra-er = Traído
2.Leer = Le-er = Leído
3.Oír = O-ír = Oído

Forming the Perfect Tenses

The Past Perfect/PluPerfect Tense:

Note: With the Perfect Tenses the Past Participle will always end in “–o” despite the gender or the amount/number of the subject(s). For example:
2.El hombre ha roto el escritorio. – The man has broken the desk.
3.Habíamos comprado todo. – We had bought everything.
4.Ya habían vendido la casa. – They had already sold the house.
Using the Present Perfect and PluPerfect /Past Perfect Tenses
b.Ya han discutido y son amigos de nuevo. – They have already argued and are friends again.
c.¿Quién te ha dado esta autoridad? – Who has given you this authority?
2.The Pluperfect/Past Perfect Tense is used to state that a past activity had taken place. For example:
b.Habíamos visto esta misma película ayer. – We had watched this same movie yesterday.
c.Habían escogido el ganador. – They had already chosen the winner.