In this concise, user-friendly book, David Crystal draws on his extensive knowledge and experience to answer questions from English language teachers and learners from around the world. The book covers topics ranging from general enquiries about the language as a whole to specific points of grammar, pronunciation, orthography, vocabulary, idiom and style. The author's responses are illustrated by personal anecdotes, placed within historical and literary context and supported by research and corpus data to provide unique, authentic insights.