Spanish grammar book (Español A1-B2)

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. (can also be used as a companion book for apps) (with excersise part and solutions)