This reference is intended for students and teachers of English who need advice on relatively advanced aspects of English usage. It covers those aspects which perplex students - the aspects that they continue to get wrong in speech and writing. The book aims to help students get nearer to a native command of English and to give them self-confidence. The problems covered include: grammar and vocabulary, communicative functions, punctuation, format of letters, pronunciation and intonation. Entries are arranged alphabetically and there are several cross-references.