How do you form the pluperfect active subjunctive?
In the subjunctive mood, the perfect and pluperfect tenses are formed by adding the relevant form of 'esse', – 'to be' – to the past participle of the verb.
In the subjunctive mood, the perfect and pluperfect tenses are formed by adding the relevant form of 'esse', – 'to be' – to the past participle of the verb.