Solve the mysteries of Spanish irregular verbs Practice Makes Spanish Irregular Verbs Up Close puts the spotlight on this tricky grammar trouble spot. It boasts plenty of opportunities for practicing your language skills, as well as extensive examples based on a conversational style that will keep you engaged. The book also features a unique answer key that gives you more than just a listing of correct answers; it clues you in on the "why" behind them. This book
Good practice, but I'm not so sure about the Turboverb apparatus. I guess it's more helpful than not for learners, but irregular verb forms have to be practiced and absorbed, after which the Turboverb system will be a vestigial appendage best forgotten.