The document discusses prefixes and suffixes. It provides examples of common prefixes used to indicate time, place, size, direction, and number. It also gives examples of common suffixes used to form nouns, adjectives, adverbs, and verbs. Suffixes are divided into derivational suffixes, which change a word's part of speech or meaning, and inflectional suffixes, which create different forms of the same word. Inflectional suffixes for nouns, verbs, and adjectives are outlined.