It is a really good book for you study English. In this book you can study how to speak English and many grammatical points of English language which are very important. This book is more than 40 mb, so it may take you a little long time to download. And the book is also designed for self-study. You can learn by yourself without any teachers to guide you because the book will be a teacher for you.
To have a book which can give you knowledge of five different languages and speaking skills is really precious, so it is for you time to have this book in your pocket whatever you do and wherever you go, you should have it with you. I’m sure that you cannot learn five languages at one book perfectly, but the point is you will learn a lot about how to meet a friend or stranger and how to introduce yourself to them in a polite and culturally acceptable way.