This is one of the few Chinese Grammar books written in English for the English speaker studying Chinese. AND, it contains both the simplified characters used on the Mainland as well as the traditional characters used in Taiwan and a few other places. The book is comprehensive and has an excellent index. The only thing keeping it from a five-star rating is the errors of fact it contains in various statements about how Mandarin is being used in Taiwan. For example, page 9, section 2.4 states that some characters lose their original tone and are changed to neutral but only on the Mainland and never in Taiwan. I cannot speak for the Mainland but the tone change is most certainly current in Taiwan. (Ref: Taiwan National Normal University, Mandarin Training Center where I am studying.) There are a number of other errors of this kind.