The book "All-Ukrainian Language Deficiencies: Small German Grammar of Doubtful, False, and Ugly" by Gustav Wustmann is a collection of vivid examples of the most common mistakes in the use of the German language. The author examines in detail the inaccuracies that arise in the perception of grammatical rules and expressiveness of speech. In this book you will find many interesting and funny situations where the author comments on various linguistic cases that lead to misunderstandings and deficiencies in language perception. With a successful blend of educational and entertaining context, this book will be a useful resource for anyone interested in language and language nuances. "All-Ukrainian language deficiencies" is not only a grammar guide, but also a kind of journey into the fascinating world of the German language, which is revealed even in the smallest details of our speech.