Common Features
Whether or not it is due to genetic unity, typologically the Australian languages form a language area or Sprachbund, sharing much of their vocabulary and sharing many distinctive phonological features across the entire continent.
A common feature of many Australian languages is that they display so-called mother-in-law languages, special speech registers used only in the presence of certain close relatives. These registers share the phonology and grammar of the standard language, but the lexicon is different and usually very restricted. There are also commonly speech taboos during extended periods of mourning or initiation that have led to a large number of Aboriginal sign languages.
For morphosyntactic alignment, many Australian languages have ergative–absolutive case systems. These are typically split systems; a widespread pattern is for pronouns (or first and second person) to have nominative–accusative case marking and for third person to be ergative–absolutive, though splits between animate and inanimate are also found. In some languages the persons in between the accusative and ergative inflections (such as second person, or third-person human) may be tripartite: that is, marked overtly as either ergative or accusative in transitive clauses, but not marked as either in intransitive clauses. There are also a few languages which employ only nominative–accusative case marking.
Read more about this topic: Non-Pama-Nyungan Languages
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