Case and number suppletion in pronouns

Suppletion for case and number in pronominal paradigms shows robust patterns across a large, cross-linguistic survey. These patterns are largely, but not entirely, parallel to patterns described in Bobaljik (2012) for suppletion for adjectival degree. Like adjectival degree suppletion along the dimension positive < comparative < superlative, if some element undergoes suppletion for a category X, that element will also undergo suppletion for any category more marked than X on independently established markedness hierarchies for case and number. We argue that the structural account of adjectival suppletive patterns in Bobaljik (2012) extends to pronominal suppletion, on the assumption that case (Caha 2009) and number (Harbour 2011) hierarchies are structurally encoded. In the course of the investigation, we provide evidence against the common view that suppletion obeys a condition of structural (Bobaljik 2012) and/or linear (Embick 2010) adjacency (cf. Merchant 2015; Moskal and Smith 2016), and argue that the full range of facts requires instead a domain-based approach to locality (cf. Moskal 2015b). In the realm of number, suppletion of pronouns behaves as expected, but a handful of examples for suppletion in nouns show a pattern that is initially unexpected, but which is, however, consistent with the overall view if the Number head is also internally structurally complex. Moreover, variation in suppletive patterns for number converges with independent evidence for variation in the internal complexity and markedness of number across languages.