Existence Single verb category, in which the verb refers to objects or persons that exist in the environment. The child may look at, point to, touch, or pick up the object while naming it or pointing out its existence. Phase levels increase as existence utterances are coordinated with nonverb relations and include the copula verb form.
(Bloom & Lahey, 1978; Lahey, 1988; modified by Masterson & Apel, 00)