Speak Fluently: 日本語文法辞典 by 牧野成一

This ever-popular series of dictionary-style grammar guides comprises three volumes--basic, intermediate, and advanced--with each presenting some 200 key grammar items, along with analysis of sentence patterns, abundant example sentences, and easy-to-understand explanations in English. The books also thoroughly explains common pitfalls and the distinctions in usage of similar expressions, helping users to develop an even stronger grasp of Japanese grammar. A must-have reference for learners and teachers alike.