There are two prepositions, na, which relates a noun phrase with a verb, and ti, which relates a noun phrase to a preceding noun or a verb. The meaning of na is locative, benefactive, temporal, comitative, associative, and perhaps others. For frequencies in a corpus see Samarin (1967: 98–100). I have the impression that na has a greater functional load than it has in the source language, and it is sometimes not used, as is the case of Ngbandi. The meaning of ti is, comprehensively, genitive, with several associated meanings (see example 16). Its function is quite different from what it is in Ngbandi.