Introduction to English Grammar - Tenses and Sentence Structure This free online English grammar course teaches you about English grammar, tenses and sentence structure, giving you effective communication with other people in the English language. You will learn examples of Past, Present and Future tenses, the common mistakes made when using these tenses, and their correct usage. You will also learn the word order of a sentence structure and how to turn a sentence into a negative or a question. This will be of great interest to all English language students, language teachers, and anyone looking to improve their use of the English language. This course is complemented by a number of free English language courses hosted for free on freeengvid.