French conjugation in pluperfect subjunctive

The pluperfect subjunctive or plus-que-parfait de l'indicatif in french, is a compound tense, which means it has two parts:
  • the auxiliary verb in imperfect subjunctive (either avoir or être)
  • the past participle of the main verb

Grammatical agreement

Like all French compound conjugations, the pluperfect subjunctive may be subject to grammatical agreement:
  • When the auxiliary verb is être, the past participle must agree with the subject, except for reflexive verbs (same rules as conjugation with auxiliary avoir) and invariable past participles.
  • When the auxiliary verb is avoir, the past participle must agree with its direct object when the direct object is placed before the verb.

Auxiliaries conjugation in imperfect subjunctive

Here is the french conjugation of auxiliaries avoir and être in imperfect subjunctive to compose pluperfect subjunctive.
Auxiliary Avoir
j' eusse
tu eusses
il / elle eût
nous eussions
vous eussiez
ils / elles eussent
Auxiliary Être
je fusse
tu fusses
il / elle fût
nous fussions
vous fussiez
ils / elles fussent