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An ergative-absolutive language (or simply ergative) is one that treats the subject of transitive verbs distinctly from the subject of intransitive verbs and the object of transitive verbs.
Many languages classified as ergative in fact show split ergativity, whereby syntactic and/or morphological ergative pattern are conditioned by some part of the grammatical context (typically the persons of the verb arguments, or the tense/aspect of the verb).
As an example of split ergativity, is found in the Urdu and Hindi languages, that have an ergative case on subjects in tenses showing perfective aspect for transitive and ditransitive verbs, while for other cases subjects apear in nominative case.