This unique reference guide addresses problem points in the language as encountered by learners and their teachers. It gives information and advice that is practical clear reliable and easy to find. Most of the book is about grammar but it also covers selected points of vocabulary idioms style pronunciation and spelling. BL Over 600 concise authoritative entries. BL Explanations and examples based on current corpus research. BL Entries on kinds of English covering standard English and dialects correctness spoken and written English formality and variation and change.