Abstract This article examines the role of auxiliary verbs in forming French verb tenses. French verbs have different forms depending on person, number, and tense. While simple tenses are formed by modifying the main verb, compound tenses require auxiliary verbs such as avoir and être. The paper provides detailed explanations of twelve compound and immediate tenses, including passé composé, plus-que-parfait, passé antérieur, futur antérieur, conditionnel passé, subjonctif passé, subjonctif plus-que-parfait, futur immédiat, and passé récent. Examples, tables, and participle agreements are provided for clarity. This study also discusses nuances in auxiliary verb usage, participle agreements with gender and number, and exceptions for pronominal verbs. The research aims to give learners a comprehensive understanding of complex tense formation in French.