This document summarizes the key rules and concepts for using degrees of comparison in English grammar, including: 1. It provides examples of filling in blanks with the appropriate comparative or superlative form of adjectives such as "most difficult", "tallest", etc. 2. It identifies errors in examples comparing people, metals, months, and other nouns incorrectly. 3. It provides exercises changing examples from positive to comparative to superlative degrees of comparison, such as making "No other country is more populated than China" into "China is more populated than any other country." 4. It fills in blanks with comparative adjectives like "better/worse", provides sentences