купнаш (-ем)
{verb II} [Generate paradigm] 1. to be covered by algae, to be covered with pond scum
♢ шинчыше вӱд купна {sentence} standing water gets covered with algae
~ ASPECTUAL CONVERB CONSTRUCTIONS ~
// купнен шинчаш (-ем) {verb II} {imperfective} (see above)
♢ вӱд купнен шинча {sentence} the water is being covered by algae
--"PARENT"--> купаш (-ем)