The document discusses how to form the superlative degree of adjectives and adverbs in English. It explains that for one-syllable adjectives the suffix -est is added, for two-syllable adjectives ending in -y the suffix changes to -iest, and for other two-syllable or longer adjectives the most is used. Some adjectives are irregular. For adverbs, most take the suffix -ly and add the most, while some are irregular. Examples are provided throughout to illustrate the rules.