The document discusses the formation and uses of the perfect tense in French. It can be used to describe a past event. The perfect tense is formed with an auxiliary verb (mostly avoir) and a past participle. For regular verbs, the past participle endings change based on the verb ending. There are also many irregular past participles. Some verbs use être as the auxiliary, including reflexive verbs and MRS VANDERTRAMP verbs where subject-verb agreements on gender and number apply. When a direct object precedes the verb, agreements may also apply to the past participle.