Featuring over 400 diagrams, this book systematically explicates the most common errors in the language of Modern English through drawing on a vast archive of real-world examples taken from a number of different published sources, including bestselling novels, pop song lyrics, news articles, social media posts, textbooks, academic monographs, and philosophy classics. After a brief crash course in diagramming methods, Haag considers general sentence-structure errors, before moving on to devote chapters to errors from each of the major parts of speech. Through its use of diagrams, one will learn to not only “say” why a given sentence contains an error, but also to “show” the structure of the error in a visual form that is much clearer and much more unambiguous than the prose explanation would be.