More and more, people get interest in learning English because of its importance in different domains of life. In this learning process, learners encounter a lot of difficulties, among which is the mastery of irregular verbs. To overcome this hindrance and facilitate learning, we have made research and analysis on the inflections of more than two hundred irregular verbs. This deep analysis has resulted to the classification of fourteen groups of those verbs. Each of the groups follows a given rule to be applied. As a matter of fact, preparing, teaching and learning these verbs become easy. It is exactly the ultimate objective of this article.