I find this book very helpful as I am learning Portuguese and need to be able to write using the proper verb forms. I think it would be helpful not only to students but also to anyone who is in business of any form that requires writing in Potuguese. It is helpful to determine the correct verb form to use in any situation. I was looking for just such a book when I was in Brazil this summer. I didn't find one so was glad when our teacher required this book. I find it useful, not only for class assignments but also for writing to friends in Brazil and Angola.