In this paper, I analyze two clause combining strategies in Ossetic that exhibit mixed properties between coordination and subordination. I argue that the `mismatch approach’ proposed by Culicover & Jackendoff (1997) and Yuasa & Sadock (2002) is best suited to account for their properties. However, in order to adequately describe the behavior of these constructions in terms of the mismatch approach, appealing to three levels of grammar is required instead of two levels (syntax and semantics) discussed in previous works. This provides a clear argument in favor of models of grammar such as Lexical Functional Grammar (LFG), where the syntactic level is split between constituent structure (c-structure) and functional structure (f-structure). The properties of semantic coordination and subordination that have been proposed in earlier work mostly belong to the level of f-structure, and not semantics proper. I argue that the only substantial semantic difference between coordination and adverbial subordination is that the former introduces discourse relations between speech acts, while the latter introduces asserted predicates that link two propositions within the same speech act. I provide definitions of coordination and subordination at all the three levels of grammar formalized in terms of the LFG framework, and discuss the tests that can be used for each of these levels.
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