This article first outlines the theory of the predicative and enunciative operations (TOPE) developed by Antoine Culioli and his associates. It then shows how this theory enables one to analyse such linguistic units as the verbal prefix z- in Ikwere, spoken in Nigeria, and, more precisely, the way they operate in the language. We find that behind the various uses of z- is an invariant meaning element which consists of introducing a ranking between p and p′, i.e., two constituent values of a given unorganized notional domain, such that the domain is finally organized. It is further argued that the TAM (Tense-Aspect-Modality) category, which z- is related to, is constructed by the utterance in which z- occurs.