This document discusses infinitives and infinitive phrases. It defines an infinitive as a verb form beginning with "to" followed by the base verb form, and can be used as a noun, adjective, or adverb. An infinitive phrase consists of an infinitive and its object or modifier. Examples of how infinitives and infinitive phrases can be used as subjects, predicate nominatives, direct objects, adjectives, and adverbs are provided. Infinitive phrases can also contain an object or modifier.