title: On the early learning of formal grammatical systems: evidence from studies of the acquisition of gender and countability.
authors.forename: Y
authors.initials: Y
authors.lastname: Levy
mesh_terms: D000367:Age Factors; D002648:Child; D002663:Child Language; D002675:Child, Preschool; D005783:Gender Identity; D006801:Humans; D007062:Identification, Psychological; D007223:Infant; D007804:Language Development; D008037:Linguistics