It's crazy that you can buy this book for only $12. (amazon.ca) It's full of useful information that will help you understand how to use verbs in different tenses... the explanations are clear and there are examples after them and plenty of useful exercises (mostly translating sentences and paragraphs but there are a few true and false) . Going through the book thoroughly once, I've improved my spanish and I'm now a lot more confident with using verbs. There are a couple things that would have been good to include...
One thing is, like another person said, mixing things that you have gone over earlier in the book with newer info for exercises. It would help a lot. Going over irregular verbs even more would help as well. Still, the book is great, lots of info, lots of exercises, I've been studying spanish for a while and I don't see any noticeable typos..there's a little dictionary part at the back, spanish-english and english-spanish. The book is well organized and in my opinion, it's worth even 5 times the price. ( )