Re: Ergativity Question

Caleb wrote: "Active voice: Subject = Agent(required), Object = Patient(may
or may not be present) [...] Antipassive voice: The oppsosite of passive,
and thus the same as active."

I thought that "active voice" means that the subject (agent) *and* object
(patient) are required, and "antipassive voice" means that the object
(patient) is optional.