The app is for learners of English grammar. It can be used as a self-study guide, without the help of a teacher. The 136 units of the app cover all sections of English grammar. Each unit deals with a specific topic and consists of ‘Lesson’, ‘Exercises’ and ‘Answers’ sections. There are also additional 7 appendices which go through incorrect verbs, spelling rules, modal verbs, short forms, and nuances about differences between British and American English. In the ‘Test’ section of the app, you can test your knowledge and identify the topics you need to learn. If you like the app, don't forget to rate it))