Two construals of agency are evaluated as possible innate biases guiding case-marking in children. A
BROADconstrual treats agentive arguments of multi-participant and single-participant events as being similar. A NARROWERconstrual is restricted to agents of multi-participant events. In Hindi, ergative case-marking is associated with agentive participants of multi-participant, perfectiveactions. Children relying on a broad or narrow construal of agent are predicted to overextend ergative case-marking to agentive participants of transitive imperfective actions and/or intransitive actions. Longitudinal data from three children acquiring Hindi (1;7 to 3;9) reveal no overextension errors, suggesting early sensitivity to distributional patterns in the input.