Practical English Usage. Second Edition. Michael Swan

Practical English Usage is a dictionary of problem points in the language for foreign learners and their teachers. It answers  the learner´s  question, ´Is this right or wrong, and why?´ and the teachers question, ´How can I explain this to my classes?´It gives information and advice that is practical, clear, reliable and easy to find. Most of the book is about grammar, but it also covers selected points of vocabulary, idiom, style, pronunciation and spelling.