This is a course of lessons and practice on the system of English. It is divided into eighty-six sections. Each section covers an area of basic grammar and contains a number of exercises. The exercises are not all the same length. Some exercises have only five questions, but others have up to nine questions. This is because some areas of grammar are more important than others. This course tests your knowledge of English grammar and, more importantly, it gives you practice in using your knowledge to make correct and appropriate sentences. When you do the exercises, you will see that grammar is not just a game. Grammar has meaning - if you change some of the grammar in a sentence, you also change its meaning.