It was very difficult to find information on your Textbook, because it is so recent --- late January 2011. But I now have a teacher's syllabus, the Course Description and Content. It's interesting that your textbook is used in Denmark! Studying the Table of Contents, I'm guessing you are in Chapter 6?
Have you heard at all of McGraw-Hill's GradeSummit? Since I could not enter the site, I wrote requesting information. http://www.gradesummit.com
As I can not look inside your textbook, I can't see the sort of "explanation" for each tool you are using, but I know the emphasis is less on the grammar, and far more on the use of the language.
In any event, I am anxious to learn more about what you are studying and very willing to help you.