Learn Spanish easily..This is a grammar book for learning the irregular verbs and can also be used as a companion book for apps. Since the irregular verbs are a difficult subject, the book specialized in it. But it also contains other grammar units such as the use of the subjuntivo and imperfecto vs. indefinido. (how nice it would be if you had the regular verbs and the most important irregular verbs in almost all tenses and moods in a book to look up..?) - with further grammar units (with excersise part and solutions)