My thesis investigates the universality of the Matrix Language Frame model developed by Myers-Scotton (2002). The work tests the model by using bilingual data which display code-switching between French and the low variety of Lingala. The main concern of the work is to test the constraints that are posited in terms of principles of the model and which claim that the Matrix Language dictates the morphosyntactic frame of a bilingual Complementizer Phrase (CP). In the light of the findings of this study, it was shown that the ML model failed to account for a number of situations; and such was the case of the Morpheme Order Principle and double morphology, specifically with the outsider late system morphemes.