The book "501 French Verbs: Fully Conjugated in All the Tenses in a New Easy-To-Learn Format" by Christopher Kendris is a comprehensive guide for learning French verb conjugations. It covers 501 commonly used verbs and provides their conjugations in all tenses, making it a valuable resource for French language learners looking to master verb usage. The book's easy-to-learn format offers a practical and organized approach to studying verb conjugations, making it an essential tool for anyone looking to improve their proficiency in French.