Irregular Pluperfect
Spanish: Cambridge International GCSE, topic 10.4.8
Irregular Pluperfect
To form the pluperfect tense using irregular past participles, you use the imperfect of ‘haber’ plus the past participle of a verb. It means 'to had (done) something. For the past participle refer to 6.1.1.

Había visto - I had seen

Habías abierto - you had opened

Había muerto - he/she had died / you had died (formal)

Habíamos hecho - we had done

Habíais descubierto - you had discovered (plural)

Habían supuesto - they had assumed / you had assumed (formal plural)
Test yourself on Irregular Pluperfect
How do you say 'I had covered' in Spanish?