English, like all languages, is changing, and British English is currently being quite strongly influenced by American English. Consequently, some usages which were unusual in standard British English a few decades ago have now become common - for example, the use of like as a conjunction (e.g. like I do), or the use of Do YOll have . .. ? to ask about the immediate present (e.g. Do you have a light?>. The third edition takes account of a number of changes of this kind, in order to give a fully up-to-date description of contemporary usage.
Michael Swan is a writer specializing in English Language teaching and reference materials. His many publications include Practical English Usage (OUP), the Cambridge English Course series (with Catherine Walter), and, also with Catherine Walter, the new Oxford English Grammar Course. Michael’s interests include pedagogic grammar, mother-tongue influence in second language acquisition, and the relationship between applied linguistic theory and classroom language-teaching practice. He has had extensive experience with adult learners, and has worked with teachers in many countries.