Active English Grammar 1, 2nd Edition w/Workbook and Answer Key (intermediate-level series provides thorough understanding of the mechanics of the English language)
Active English Grammar 2, 2nd Edition w/Workbook and Answer Key (intermediate-level series provides thorough understanding of the mechanics of the English language)
Active English Grammar 3, 2nd Edition w/Workbook and Answer Key (intermediate-level series provides thorough understanding of the mechanics of the English language)