Hello, I am an English teacher for 30 years, and since I found ENGLISH GRAMMAR IN USE Raymond Murphy, everything changed for my English teaching and my students. I did this work at all levels, and especially to people who had a very bad education in English and were totally clueless. What they appreciate is that the exercises are opposite explanations, and my them, it was very important to do a lot of exercises to restore confidence, because they had very low opinion of their own skills. Raymond Murphy helped them come to terms with the English. I thoroughly recommend it to anyone who wants to improve their English grammar skills, or who wants to prepare a test (eg TOEIC)