Big, bigger, or biggest? Children practice working with comparative and superlative adjectives in this grammar worksheet. Students learn that a comparative adjective is used for comparing two people or things, and that a superlative adjective is used for comparing three or more people or things. They then complete a series of five sentences (including one challenge sentence!) with the correct form of the adjective listed. Designed for a third and fourth grade literacy curriculum, this worksheet helps students correctly identify and use comparative and superlative adjectives.