This document discusses the rules for using comparative and superlative adjectives in English. It explains that the comparative form is used to compare two things and the superlative is used to compare three or more things. It then outlines three rules for forming the comparative and superlative of adjectives: 1) one-syllable adjectives typically add -er and -est, 2) two-syllable adjectives ending in y change the y to i and add -er and -est, and 3) adjectives of two syllables or more not ending in y add more and most in front of the positive form. There are also some irregular adjectives that do not follow these rules.