Bas Aarts is Professor of English Linguistics at University College London. He has published many books and articles on English grammar, most recently the Oxford Modern English Grammar. The late Sylvia Chalker was the author of several grammar books, including Current English Grammar and The Little Oxford Dictionary of English Grammar. She was also a contributor to The Oxford Companion to the English Language. Edmund Weiner is Deputy Chief Editor of the Oxford English Dictionary and co-author (with Andrew Delahunty) of the Oxford Guide to English Usage.