To ask; to question.
Kapag- to dare to ask a question. When kapaN- is used there is s.t. compelling you to ask. The difference between nilaw aku and nilaw niyaku is that the question with aku is directed to s.t. about aku. With niyaku the question is about s.t. else as when wanting to know the answer or reason for s.t.
He's always asking me when I am leaving on a trip.