kupnem
{verb II} [Generate paradigm] 1. to be covered by algae, to be covered with pond scum
♢ šinč́ə̑še βüd kupna {sentence} standing water gets covered with algae
~ ASPECTUAL CONVERB CONSTRUCTIONS ~
// kupnen šinč́em {verb II} {imperfective} (see above)
♢ βüd kupnen šinč́a {sentence} the water is being covered by algae
--"PARENT"--> kupem