I must explain I learned the English language by learning Spanish. I felt that my English was quite good, but this book gave me an explanation of why I was setting up a sentence construct and the better ways of rephrasing.
This book needs a sequel in that it needs to look at general people sentence constructs and then better ways of writing.
The book is good providing you already have some knowledge of grammar in the first place. It would have been helpful to have had exercises for each section of each chapter, or an accompanying exercise and anwswer book.