Bob Knowles (@BobK99) studied languages and linguistics at the University of Cambridge, and after a number of editorial positions began a 20-year career as a Technical Writer. In 2004/5 he studied for a PGCE, and afterwards a CELTA (an English Language Teaching certificate). Since then he has been a self-employed teacher and creator of teaching materials, and a contributor to the TESconnect Resource bank. Since late November 2006 he has moderated the UsingEnglish forums at UsingEnglish.com. In 2012 he was nominated for the Macmillan Education Award for Innovative Writing in the 2012 ELTons, wi...