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In the literature, it is often assumed that ergative constructions originate in passive constructions. The present contribution explores the likelihood of such a passive-to-ergative analysis for one language (Tima, Niger-Congo, Sudan), showing that this analysis cannot be substantiated and suggesting an origin in active constructions instead. This study is situated in its areal context (outlining similarities to split case marking systems across the region, especially in the Southern branch of Eastern Sudanic) and against the background of discussions in the Indo-Iranian family (from where the passive-to-ergative hypothesis presumably spread).

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This commentary on Kidd and Garcia takes a language documentation perspective on diversifying language acquisition research. Following a brief summary of relevant research in Papuan languages, it sketches out current developments to extend into child language documentation. It is argued that these developments constitute a unique opportunity to engage with on-going discussions on best practice in order to ensure that the resulting documentations are of use to both fields: language documentation and language acquisition.