In this article we offer up a particular linguistic phenomenon, quantifier-variable binding in Kannada ditransitives, as a proving ground upon which competing claims about learnability can be evaluated with respect to the relative abstractness of children's grammatical knowledge. We first identify one aspect of syntactic representation that exhibits a range of syntactic, morphological, and semantic consequences both within and across languages, namely the hierarchical structure of ditransitive verb phrases (Barss & Lasnik 1986, Larson 1988, Harley 2002). Next we show that while the semantic consequences of this structure are parallel in English, Kannada, and Spanish, the word order and morphological reflexes of this structure diverge. Thus, although it is clear that the same structures are exhibited cross-linguistically, the evidence available to learners that would allow them to identify these structures is variable. We then turn to an examination of children learning Kannada, demonstrating that they have command of the relation between morphological form and semantic interpretation in ditransitives with respect to quantifier-variable binding. Finally, we offer a proposal on how a selective learning mechanism might succeed in identifying the appropriate structures in this domain despite the variability in surface expression.