This book summarizes the main ideas to show that parts-of-speech of Chinese is the core issue of grammar research, while issue of verbs and nouns is the most important part. The views on them and their relationship directly affect researchers' understanding of many important issues in grammar research, such as the definition of nouns, category overlap, the compliance of head feature convention, and the nature of subject-predicate structure, among many others. Furthermore, such a problem may affect researchers' understanding of the whole theoretical system of Chinese grammar. This book...