In the early lessons where there is a present tense verb that uses “i” to mark the object, we always saw the article used before the direct object noun. In the ordering food lesson they start to introduce the past tense and more verb negation, and something is happening with the article being omitted in sentences like “Ua ‘oka au i koloaka lōpu”. Why don’t we put the “ke” before soda in a sentence like this? Can someone explain the pattern or rule for dropping the article. Is it because of the past tense?