An infinitive phrase consists of an infinitive verb form, usually preceded by the word 'to', and can include objects and modifiers. These phrases can act as nouns, adjectives, or adverbs in a sentence, adding depth and detail to the actions and descriptions within the narrative. In the context of Vergil's 'Aeneid,' especially in Book 1, lines 494โ578, infinitive phrases are often employed to convey purpose and intention, enhancing the epic's themes of fate and divine intervention.