paka- mod. non-past form; functions to encode the negative ability of an agent to do what the verb expresses; cannot do something. <This prefix co-occurs with the negative form adi.> Athidi bon nah hilong ta adi ka pakahuyop. It’s like that at night, too, so that you cannot sleep. Mu hanada ken iibana ya adi da pakatibo kediyen golang. But as for his companions, they could not see that child. (sem. domains: 9.2.9.1Verb affixes.)