The document discusses gerunds and infinitives. It defines a gerund as a verbal ending in "-ing" that functions as a noun, occupying positions like subject, direct object, or object of a preposition. It provides examples like "traveling might satisfy your desire for new experiences" where traveling is the gerund subject. Similarly, it defines an infinitive as a verbal consisting of "to" plus the base verb form, functioning as a noun, adjective, or adverb, and provides examples like "to wait seemed foolish." The document aims to help students understand and differentiate between gerunds and infinitives.