This book is helpful/useful to those who are interested in learning the Tongan Language and learning the Tongan sentence structures, grammatical sentences, its provides Lessons that makes you form simple, to medium, to advance phrases. The book was written by a Former LDS (Latter-day saints) missionary serving in Tonga, he wrote this book to help other missionaries to talk to locals in Tongan. The book helps alot with conversing with others, and can also make you write stories and more, and it also provides reccomendations that will help you learn and remember the Tongan Language permenantly. This book also explains extras, such as pronounciation, and explains how "locals" or the "The people Tonga" pronounce their own words, the book will definitely advance your tongan. If your born of tongan decendants, and cant speak the Tongan Language, this book is a must-read.