Collins & Postal (2014) argue that English NPIs have two distinct syntactic structures: a unary NEG structure and a binary NEG structure. They suggest that this distinction is generally valid for natural languages. This formal difference was taken to reconstruct the common distinction in NPI studies between strong and weak NPIs. The present analysis of Ewe NPIs seeks to provide cross-linguistic support for this dual conception of NPIs by showing that the ke-NPIs in this language are all properly analyzed exclusively as unary NEG structures.

中文翻译：

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母羊中的负极性物品

Collins & Postal (2014) 认为英语 NPI 有两种不同的句法结构：一元 NEG 结构和二元 NEG 结构。他们认为这种区别通常对自然语言有效。这种形式上的差异被用来重建 NPI 研究中强 NPI 和弱 NPI 之间的共同区别。目前对母羊 NPI 的分析旨在为 NPI 的这种双重概念提供跨语言支持，表明克-这种语言中的 NPI 都被正确地分析为一元 NEG 结构。