In what I consider the default lect, tone is not used in grammar, as it is in the source language Ngbandi. Marcel Diki-Kidiri, however, believes differently. For some speakers, replacing the low tone of the pronoun lo [3SG] to high results in a change in mood, from indicative to something like subjunctive. This is a remnant of what exists in the source language. I found only one instance in many hours of recordings of young people in the 1990s in Bangui. There are also a few fossilized predicates: e.g. ade lo ga ape [PM (with H instead of L tone)-remain 3SG come NEG] 'He/she hasn't come yet.'