This document provides information about conjugating verbs in the past tenses (passé composé and imparfait) in French. It explains that passé composé uses either avoir or être as an auxiliary verb along with the past participle. For avoir verbs, the form remains the same across subjects, while être verbs change form based on subject gender and number. There are 14 specific verbs that use être. It also discusses the negative form and gives examples of conjugating verbs in the imparfait tense based on patterns formed from the nous form.