This book, along with the Student's Manual II, forms the base of the methodology of Vaughan Systems. We will find explanations grammar, but with a newness, they are in Castilian! Finally we will be safe of to have included/understood the theoretical explanation well! Next, we will find multitude of real examples, used in daily situations. In addition, the book insists on the articulation, but with an approach very easy to apply: “to lot of” pronounces “alátaf” or “won't” pronounces “uóunt”. Writing by Richard Vaughan, President and founder of Vaughan Systems, the Student's Manual is the basic tool to follow a class with professor of Vaughan Systems. Book I begins with the simplest structures of the language, but also with most fundamental: dominion of the verb “to sees”, possessive adjectives, pronouns, readings, numbers and dates, future, present continuous, etc. For Spanish Speakers