In this paper we analyse the occurrences of verbal participial forms as adjuncts within a noun phrase. We also establish constraints that do not allow certain monoargumental verbs to occur in this environment. Differently from participles of two argument verbs, we noticed that some participles of one argument verbs cannot work as adjectives, while others can. This is because of the type of arguments each verb selects: since the arguments of certain one argument verbs share the same features of internal arguments, the participles of these verbs can occur as adjectives, and therefore we can classify these as unaccusative verbs. We also investigate the semantic properties of the arguments which allow a participial form as a modifier.