This document discusses how to form comparative adjectives in English. It explains that one-syllable adjectives typically take -er, adjectives with one vowel and one consonant double the consonant before adding -er, and two-syllable adjectives ending in y change the y to i before adding -er. It also notes that longer adjectives or two-syllable adjectives not ending in y take more, and lists some irregular comparatives like good/better and bad/worse. Examples are provided to illustrate using the comparative forms in comparisons with than.