Peter Collins is a retired Professor of Linguistics from the University of New South Wales in Sydney, Australia. He has published more than a hundred academic books, articles and book chapters. His research interests include English grammar, World Englishes (particularly Australian English), and corpus linguistics. Carmella Hollo is a retired Lecturer in Linguistics from the University of New South Wales in Sydney, Australia. Her teaching has concentrated in the areas of English grammar, introduction to linguistics courses and historical linguistics.