This book focuses on expressions and grammatical constructions that often cause confusion or sound somewhat illogical to foreign learners. It is completely written in Chinese with very few exceptions (mainly to clarify a word). But fear not 😉 the language used in this book is kept at a very basic level making it really easy to understand. So even learners who just completed a beginner’s course are able to read this book without any major problems. In fact, I think it is a very good reading practice, too.