Negation and polarity-reversing effect of an interrogative marker in Pwo Karen

In Pwo Karen, main clauses are negated by ʔé, subordinate clauses by lə ... bá, and imperative clauses by ləxì̱. In addition to these negators, the expression bá ʁâ, which consists of the verb bá ‘be right’ and the interrogative marker ʁâ, can be used as a negator. Conversely, when the negator ʔé, which is used at the end of the main clause, is followed by the interrogative marker ʁâ, the sentences may be used as affirmative ones. Thus, we can say that in Pwo Karen, polarity may be reversed by the presence of an interrogative marker