Why has the grammar of Dyirbal been important to linguists?

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Distinctive features of Australia's Indigenous languages — Australian Aboriginal languages A discussion of the languages of Indigenous Australians.

The grammar of Dyirbal has been significant to linguists because some scholars once argued that it represented a "deep" grammatical feature known as ergativity.1

Under this interpretation, Dyirbal syntax was viewed as a "mirror image" of the subject-object syntax found in English and most other languages. Specifically, this model suggested that in Dyirbal, direct objects possess the special syntactic status that subjects hold in languages like English. While this mirror-image model was controversial and has been the subject of debate, it highlighted how the study of Australian Aboriginal languages can challenge core assumptions within linguistic theory, particularly regarding how languages organize syntactic coherence without relying on fixed word order.1