This document discusses prefixes and their meanings. It provides examples of common prefixes like "dis", "non", "mis", and "un" which typically have negative meanings like "not" or "opposite of". It then lists words and asks students to identify their opposites using these negative prefixes, like making "patient" become "impatient". Finally, it asks students to change words to their negative forms using the prefixes, such as changing "correct" to "incorrect". The document is teaching about identifying and using negative prefixes to modify word meanings.