This paper reports the results of an experiment on the telic/atelic distinction in Hebrew transitive constructions. Using a variant of the Truth Value Judgment task (Crain & McKee, 1985; Crain & Thornton, 1998), six different constructions were tested: definite/indefinite singular count noun (e.g. 'eat the/an orange', 'draw the/a flower'), definite/indefinite plural count noun (e.g. 'eat the/0 oranges', 'draw the/0 flowers'), and definite/indefinite mass noun ('eat the/0 rice', 'spill the/0 water'). Results show that in adult Hebrew there is a clear distinction between telic and atelic predicates. Telic predicates (i.e. the three definite constructions and the indefinite singular count) tend to be rejected as true descriptions of incompleted events, while atelic predicates (the indefinite plural and mass constructions) are freely accepted as descriptions of the same incompleted events. In contrast, data from a group of six year old Hebrew speaking children show a very different pattern: both telic and atelic predicates are rejected as true descriptions of incompleted events. The phenomenon of overgeneration of the definite determiner is discussed as a possible explanation for these findings.