Stability and Change in Intransitive Argument Structure

The argument structure of verbs is pretty uniform across languages. Thus, verbs of 'falling' involve a Theme and an optional Causer and verbs of 'working' an Agent. Aspect is relevant to that uniformity as well since the former verbs will be telic and the latter durative. Stative verbs form a third main class. I first show that, when (spoken/written) languages change, the basic argument structure and aspect don't change for most unaccusatives and unergatives. There are, however, systematic reports (e.g. Rosen 1984; Keller & Sorace 2003; Randall et al 2004) that certain verbs are unergative in one language and unaccusative in another and that verbs alternate between different aspects (e.g. Levin & Rappaport Hovav 2014). I examine a few verbs diachronically that are ambiguous in the Keller & Sorace work, i.e. verbs of continuation and of controlled motional process, and conclude that a more fine-grained system is helpful.