The main goal of this project is to investigate the interaction of negation with other functional elements in the clause in representative languages of two distinct language families of the Niger-Congo phylum. The central theoretical hypothesis is that morpho-syntactic interactions are found with most of the central functional projections along the sentential spine, especially at the phase edges, with formal and functional variation at their respective peripheries. The project mainly focuses on interactions of sentential negation and the expressions of tense, aspect (vP periphery), as well as focus, and imperatives (both CP periphery). The languages to be investigated in this project all show a very rich inventory of elements for the expression of the various functional domains.