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1. Rules:A rule in grammar is a generalization. It is a formula that one makes to account for how a given grammatical construction usually behaves.A rule is not necessarily true in every instance. It is generally true. Don't be concerned if you see or hear something that does not coincide with a rule in this book.
In this guide:Parentheses ( ) indicate optional usage when used in a rule.
Braces { } indicate either one choice or the other.
2. Method of Study The best method of improving your use of English grammar with this guide is to study the formulas and sample sentences. Then do the practice exercise at the end of each section. After each group of lessons, there is an exercise using grammatical points from the preceding explanations. If you still make errors, the practice test answer keys and the index give you the page number of the explanation to study again. .