books.google.com - Updated and expanded, this book fills a double purpose as both a useful classroom text and a practical style manual for writers. It reviews English grammar, sentence structure, punctuation, and correct word usage, and advises on adapting writing style to different formats, including both classroom assignments,...https://books.google.com/books/about/Essentials_of_English.html?id=RETEl5K43qsC&q=verb+form&utm_source=gb-gplus-shareEssentials of English
