This document discusses suffixes and their uses. It defines a suffix as a word part added to the end of a word that conditions its meaning or usage. It provides examples of common suffixes that can transform nouns into adjectives (e.g. -ful, -ary) or form adjectives from nouns (e.g. -ic, -ical). Inflectional suffixes are also discussed, which can change verbs or nouns (e.g. -ed, -s). Knowing suffixes helps expand vocabulary by understanding new words. Exercises are provided to practice identifying and applying suffixes. In summary, the document outlines common suffixes, their functions, and the importance of understanding them for vocabulary development.