Vocab:

Wa-la – nothing / absence of (used for past / progressive tense)
Ka-on – eat
Pa-ni-ud-to – lunch
pa – Still / yet
na – Now / Already

eg.

Mikaon ka ba sa imong paniudto? – Did you eat your lunch?

Explanation:

“mi” prefix in front of kanon marks it as past tense.
“ka” personal pronoun for YOU
“ba” is a question marker asking
“imong” is YOUR

As with any yes or no question the respondent can provide more information.

Here are two possible answers:

Wala pa – Not yet but probably will later
Wala na – No and the person is expressing that he/she has no plan to eat anymore