TABLE 1.

Event types and their properties.

Event type	Properties of patient	Property of verb (action)	Example	Potential role confusion
Reversible	Animate	Reversible	Boy punches man	High: both participants can plausibly take both roles
Weakly non-reversible	Inanimate	Reversible	Boy punches watermelon	Medium: Agent could plausibly be patient, but patient unlikely to be agent
Strongly non-reversible	Inanimate	Non-reversible	Boy eats watermelon	Low: Agent unlikely to be patient, patient unlikely to be agent