| Summary: | Sorace (1993) suggests that competence at the final stage of non-native acquisition falls into qualitatively distinct categories: (1) incomplete grammar, which lacks a representation for a part of the target system; (2) divergent grammar, which has the target distinctions with non-target instantiations. She captures the general nature of the two systems but leaves their contents undefined. This study adopts her proposal and investigates non-native grammars with respect to acquisition of the Polish aspects: completive, pofective and perfective, in an attempt to define the properties of incomplete or divergent knowledge in the domain of aspect. === According to the account of the aspectual system of Polish proposed in this thesis, acquisition of this system requires knowledge of the following semantic and morpho-syntactic properties: (1) aspectual interpretations, which depend on the semantic features of a VP; (2) the semantic features carried by the aspects; (3) the distinct feature context required for each aspectual interpretation; (4) restriction on feature composition with respect to the syntactic domain of derivation, namely l(exical)-syntax vs. s(syntactic)-syntax. The learners' competence, therefore, must contain information about which feature context yields which interpretation, which interpretations are unrealizable in these contexts, and which aspectual structures are allowed by virtue of their syntactic vs. lexical feature character. The Polish aspectual system involves many elements of knowledge that must be acquired for the L2 end-state to be complete. It also provides a wide range of properties whose nontarget status would lead to a divergent grammar. === Experimental data were elicited from two groups of English speakers who were advanced or near-native learners of Polish in a series of tests (grammaticality judgments, semantic and end-state compatibility tasks, and picture selection) each addressing separate sets of restrictions governing the system. Results were compared to native speaker adult and child controls. === Although the results reveal two types of competence, these cannot be categorically defined as either complete or divergent. While the near-natives' knowledge manifests a complete representation of the elements of the target grammar and native-like distinctions between the aspects, it also bears some characteristics of an incomplete system. The advanced learners manifest a system that is both divergent and incomplete. The study shows that the classification proposed by Sorace (1993) is only appropriate with reference to individual properties of grammar, as a single system of knowledge may show the characteristics of complete, incomplete, divergent and, possibly, non-divergent competence.
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