Practical English Usage is a comprehensive textbook aimed at teachers, aspiring teachers, and advanced learners of the English language. In its fourth, revised, and updated edition, it provides clear, corpus-based explanations and examples for common questions regarding grammar and vocabulary. The book is divided into two main parts: the first part addresses practical grammar and includes 28 sections that deal with structural points that often pose challenges for learners. The second part offers a comprehensive guide to vocabulary issues, including rules for word formation and spelling, as well as an A-Z directory of over 250 common word problems. With over 600 entries, the book answers typical questions that learners ask and is available in both print and online formats.