This site provides interactive tutorial instruction in English grammar for language arts, home-school, or ESL students. Four volumes, Word and Phrase Patterns, Phrase Patterns, Verb Tense and Verbal Patterns, and Verb Forms and Sentence Patterns, are currently available.
Students can use the exercises repeatedly until they achieve mastery.
Users receive immediate feedback and have the option of printing or e-mailing the exercises to their teacher. The first half of the book consists of lessons on syntax, while the rest of it deals with prescriptive errors and their avoidance. Choose a chapter and get to work. Each chapter is subdivided into short sections, and has a navigation bar along the left plus a set of 5 quizzes to grill yourself and determine how you're doing. It's demanding, but the book is effective and clear.