This document provides instruction on using the articles "a", "an", and "the" in English. It explains that "a" and "an" are used before singular nouns to refer to one unspecified person or thing, with "an" used before words beginning with a vowel sound. "The" is used to refer to a specific or defined noun. It gives examples of when to use definite ("the") vs indefinite ("a"/"an") articles. It also discusses cases where no article is used, like with names or plural nouns. Exercises are included to help readers identify the correct article in different contexts.