In this talk, we present a little-discussed puzzle from Clitic Doubling (CD) in Greek: CD of plural indirect objects is ungrammatical. We argue that this ungrammaticality is due to a morphological mismatch between the form of the clitic, which is syncretic for accusative and genitive, and the form of the determiner, which is not syncretic. We argue that the data provide support for movement-based theories of CD, and provide a new diagnostic for distinguishing between CD and object agreement: if morphological mismatches of the Greek type lead to ungrammaticality, the relevant phenomenon must be an instance of CD.
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