They find Wade’s book, often recommended as the "ideal support book" for any Russian course.
Dedicated sections for regular and irregular verbs, explaining the difference between imperfective and perfective aspects . The Oxford Russian Grammar & Verbs
Written by the late renowned Russian scholar , this guide was first published by Oxford University Press in June 2002 . Wade’s mission was to distill the notoriously complex world of Russian syntax—six grammatical cases, two verb aspects, and a flexible word order—into a clear, pocket-sized reference. The "narrative" for most readers follows a familiar arc: They find Wade’s book, often recommended as the
Thousands of examples illustrate grammar points as they appear in both written and spoken modern Russian. The Oxford Russian Grammar and Verbs - Amazon.co.za They find Wade’s book