x Introduction
that, you will read many examples of this common error and have an opportunity to
correct them.
Correct: Tom and I work in the same offi ce.How to Use This Book
Each chapter is fi lled with Written Practice exercises that help reinforce the new
grammar concepts you learn. You are strongly encouraged to complete each exer-
cise to help identify your strengths and weaknesses as you use this book. Check the
Answer Key to fi nd out where any errors exist in your use of English.
Each chapter ends with an open-book quiz with ten questions that review the
concepts introduced in the chapter. You should try to achieve a score of eight out of
ten on a quiz before moving on to the next chapter. Each of the four parts ends with
a test of fi fty multiple-choice questions that review the content of that part. These are
closed-book tests, and you should try to get a score of 75 percent before moving on
to the next part. The book concludes with a fi nal exam with one hundred multiple-
choice questions that test your knowledge of all the grammar and usage content of
the book. A good score on this exam is 75 percent.
The English Grammar Demystifi ed chapters are meant to be studied consecu-
tively. From the fi rst chapter on, you will build your English language skills, one
upon the other. Don’t skip anything! The only chapters that may (and probably
should) be studied on a different schedule are Chapters 10 and 11. Spelling and
word usage are almost never-ending challenges for some people; consequently, an
organized, segmented approach works better. You simply can’t absorb all that these
chapters teach in one sitting. So make studying those chapters an ongoing activity.