The pluperfect subjunctive tense is a tense reserved for literary contexts. It is similar in use to the imperfect subjunctive , and consists of the imperfect subjunctive form of the auxiliary verb followed by a past participle.
Modern usage exists only in the third person.
Marie f t partie . I was happy that Mary had left. In modern usage the pluperfect subjunctive has been replaced by the present perfect subjunctive. J' tais content que Marie soit partie . I was happy that Mary had left.