Case hierarchy
In linguistic typology, the case hierarchy is a particular order of cases where languages that lack a particular case are unlikely to have any of the cases listed after it in the hierarchy. It was developed by Australian linguist Barry Blake. The hierarchy is as follows:
- nominative → accusative or ergative → genitive → dative → locative or prepositional → ablative and/or instrumental → others.
This is only a general tendency, however. Many forms of Central German such as Colognian or Luxembourgish have a dative case but lack a genitive. In Irish nouns, the nominative and accusative have fallen together, whereas the dative–locative has remained separate in some paradigms; Irish also has a genitive and vocative case. In Punjabi, the accusative, genitive, and dative have merged to an oblique case, but the language still retains vocative, locative, and ablative cases. Old English had an instrumental case, but not a locative or prepositional.
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