Detail #68: Participle-morphology on non-verbs

In some conlang with a system of four participles - active perfective, passive perfective, active imperfective, passive imperfective - and where copulas usually are not dropped, negated adjectival complements for some reason take no copula, but instead take participle markings. Which particular participle goes on the adjective depends on lexical as well as contextual factors. Since the copula is dropped, this usually leads to the aspect of the chosen participle marking to serve tense-aspect-mood functions, while the voice sometimes marks details that usually would be visible in which particular copula was picked. However, the copula system of the language has at least three different copulas, so some distinctions are lost in the negative.