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Mark Lester (Spokane, WA) is an experienced grammarian, ESL expert, and college professor. He is the author of more than a dozen books, including Grammar and Usage in the Classroom, the most widely used college grammar textbook in the country.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.