The document discusses verbals, which are verb forms that function as other parts of speech. There are three types of verbals: infinitives, participles, and gerunds. Infinitives can act as nouns, adjectives or adverbs. Participles are verb forms used as adjectives that end in "-ing" or "-ed/-en". Gerunds look like participles but act as nouns, ending in "-ing" and functioning as subjects, objects or objects of prepositions. Examples are provided of identifying and distinguishing between these verbal forms.