The document discusses verbals, which are words derived from verbs that function as nouns, adjectives, or adverbs rather than as verbs. There are three types of verbals: gerunds, participles, and infinitives. Gerunds end in "-ing" and function as nouns. Participles can be present or past participles and function as adjectives. Infinitives consist of "to" plus the base verb form and can function as nouns, adjectives, or adverbs. The document provides examples of each type of verbal and exercises for students to demonstrate their understanding.