krefu modal, 1st place (in instance / at time); in instance / case …
Example: «lo prenu be kei'u lo sepli cu bevri le pipno» means the people, at separate times, carried the piano. «lo prenu be kei'u lo mintu cu bevri le pipno» means the people carried the piano at the same time / in the same instance. See also: lo'u'a, ke'u.