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It is unknown exactly how person markers are established as either pronominal affixes, or agreement markers. There are two explanations. The first relies on synchronic change, using evidence from Classical Syriac. This analysis reveals that the same person marker may simply behave differently in different syntactic environments. The second explanation suggests that there is no clear-cut dichotomy between pronominal affixes and agreement markers at all, citing transitional cases as an example.
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