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