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This study concentrates on the interaction between languages with similar morphological and syntactic structures. It will show that code switching between morphosyntactically similar languages ofequal social function has certain implicationsfor the matrix language-frame modelfor code switching which has been developed by Myers-Scotton (1993b). The two languages under scrutiny here are Southern Sotho and Tswana, two very closely related and functionally equivalent languages spoken in South Africa. In certain contexts the Speakers ofthese languages will switch frequently from the one language to the o t her. The paper will investigate how the matrix language in this multiple switching can be determined and whether the distinction between the matrix and the embedded language is still relevant in such a Situation. Given the relatedness ofthe two languages, the implicationsfor the constraints which the matrix language-frame model proposes will also be examined. The paper concludes that in this case an interlanguage has developed which must be regarded äs a merger between the two languages. This is particularly salient in the South African context since the harmonisation of the Sotho and Nguni languages respectively has been put forward äs the Nhlapo-Alexander proposal (Alexander 1989).
