The best Japanese grammar reference in existence. In fact, for anyone above intermediate level, this is all you will ever need. Will be more useful for students than for teachers. The greatest thing about this book is its precision: it explains ALL the different uses and nuances of each grammar construction, with numerous examples and concise explanations. Three stars is not nearly generous enough. This is one of the most perfect language instruction tools I have ever seen, and definitely deserves 5 stars. It has helped me enormously.