Burzio's generalization
In generative linguistics, Burzio's generalization is the observation that a verb can assign a theta role (a title used to describe the relationship between the noun phrase and the predicate, such as agent, theme, and goal) to its subject position if and only if it can assign an accusative case to its object. Accordingly, if a verb does not assign a theta role to its subject, then it does not assign accusative case to its object.