Use this section for verbal auxiliaries, affixes, adverbs, and particles that indicate agent-oriented modalities. Agent-oriented modalities describe internal or external conditions on a willful agent with respect to the completion of the predicate situation. They may be combined with any of the tenses, either in the same morpheme or in combinations of morphemes. The following definitions are taken from Bybee, Joan, Revere Perkins, and William Pagliuca. 1994. The evolution of grammar. Chicago and London: University of Chicago Press.