Negators and the aspect markers ta PROG and ja PFV do not co-occur.
The negation of a clause that has future-irrealis reference requires the use of the negative-future-irrealis marker nádi.
In Baxter (1988: 139–141), I reported a further negator, a negator of perfective aspect, with value ‘not yet’: nenáng. It is debatable whether this item should be treated as a negator or as a negative adverb, since nenáng may occur in future contexts.
Source: Baxter 1988: 139
Source: Baxter 1988: 141