This document provides rules for using articles (a, an, the) in English sentences. It discusses when to use articles with countable nouns, singular vs. plural nouns, proper nouns, uncountable nouns, names of countries, languages, meals, years, days, and possessives. Examples are given for each rule and practice exercises provide opportunities to apply the rules. Key points covered include using 'a' with singular countable nouns, 'the' with plural or previously mentioned nouns, and omitting articles in certain cases like with uncountable nouns, names, and possessives.