Case role
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Case role

Case roles, according to the work by Charles J. Fillmore (1967), are the semantic roles of noun phrases (NP) in relation to the syntactic structures that contain these noun phrases. The term case role is most widely used for purely semantic relations, including theta roles and thematic roles, that can be independent of the morpho-syntax. The concept of case roles is related to the larger notion of Case (with a capitalised C), which is defined as a system of marking dependent nouns for the type of semantic or syntactic relationship they bear to their heads. Case traditionally refers to inflectional marking.

The relationships between nouns and their containing structures are of both syntactic and semantic value. The syntactic positional relationships between forms in sentences vary cross-linguistically and allows grammarians to observe semantic values in these nouns by examining their syntactic values. Using these semantic values gives the base for considering case roles in a specific language.

In addition to its inventory of structural cases, case theory includes a series of lexical cases that are assigned at deep structure in conjunction with theta role assignment. In addition to its relation to Case (case based on syntactic structures), these semantic notions of case role are also closely related to morphological case.

The following list of case roles is frequently distinguished in literature but is not an exhaustive list, as there is no consensus on the universal inventory of roles, nor a universal agreement as to the correct assignment of constituents to roles.

In his article on the case system of Russian, Roman Jakobson (1958) closely examines case assignment and argues for a feature decomposition of case on the basis of semantic considerations. Jakobson (1958) proposed a three-feature binary case system for Russian case which includes the following: ±marginal, ±quantifying, and ±ascriptive, where the negative value is considered to be unmarked[clarification needed]. The term marginal distinguishes the direct and non-direct cases; only the -marginal cases may occur in subject and object position. Quantifying indicates the relevance of the extent to which the noun is a participant in the event. Ascriptive puts emphasis on directionality.

Jakobson considers cases to be bundles of these three features, which can be assigned to morphological cases:

He uses these decomposed case features to account for the case alternations in subject and object position, and argues for how there should be a universal inventory of case roles.

There is a theory that multiple case roles can be assigned to noun phrases. The reasons for having more than one case role is due to the differences in the sentences’ semantic effects. Bhat (1997) proposed that the speaker of a language would have the option of assigning any single case role out of the multiple case role alternations available in a given context. This is not done by a transformational rule, but due to the deep structure representations (the core semantic relations of the sentence).

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