George Cox's 'The International Auxiliary Language Esperanto: Grammar & Commentary' is a comprehensive guide to the grammar and structure of the constructed language Esperanto. The book meticulously outlines the rules of Esperanto grammar, providing a scholarly analysis of its linguistic features and practical application. Cox delves into the history and development of Esperanto, placing it within the context of language construction and international communication. Written in a clear and authoritative style, the book serves as an invaluable resource for linguists, Esperanto enthusiasts, and anyone interested in constructed languages. Cox's attention to detail and linguistic expertise shine through in this thorough examination of Esperanto's grammar and structure. Drawing on his own experience as a language educator and researcher, Cox brings a deep understanding of language theory to his analysis of Esperanto. His work sheds light on the potential of auxiliary languages like Esperanto to foster global communication and understanding. I highly recommend 'The International Auxiliary Language Esperanto: Grammar & Commentary' to anyone looking to deepen their understanding of language construction and the diverse world of constructed languages.