The Oxford English Grammar Course is a series of three books - Basic, Intermediate, and Advanced - written by Michael Swan and Catherine Walter. Each book includes grammar rules, explanations, and interactive exercises with answers. The Basic level is for elementary and pre-intermediate learners, the Intermediate level is for intermediate and upper-intermediate students, and the Advanced level is for people who want to speak or write more correctly, perhaps for academic or professional purposes. The books teach the grammar of spoken and written British English, but can also be used by students of American, Australian or other kinds of English. CD ROM is included in the Intermediate level to help with pronunciation.