Abstract This paper examines language change in two Lingala youth languages from the DR Congo, Lingala ya Bayankee (sometimes referred to as Yanké) and Langila, focusing on processes of grammaticalization and replication. Speakers of Lingala ya Bayankee use a grammaticalized prefix ké- for the near/immediate future tense, derived from the verb kokende ‘to go’ and from a manipulated form of the same verb, namely the prefix dyé- from kodyé (with the same meaning). The emergence and development of this tense marker is traced and compared with the strategies used by Langila speakers. Moreover, the microvariationist lens through which changes in the tense-aspect system of Lingala’s youth registers are examined in this paper looks at different formation patterns of progressive aspect, with two dominant construction types in Lingala ya Bayankee; these are also compared to the strategies used by Langila speakers. While linguistic manipulations have long been the focus of sociolinguistic approaches to the study of adolescent language use, fine-grained differences in tense and aspect marking have received little attention. Here, this paper aims to take a first step, based on rich empirical data collected during various research stays in the urban environment of Kinshasa (DR Congo).