This article intends to focus on the concept of linguistic border in the verbal system of contemporary Pashto, an Iranian language mainly spoken in Afghanistan and Pakistan. A careful, systematic, and detailed analysis of used radical simple verbs in different Pashto dialects draws attention to a certain degree of variation in one third of these verbs, which are switching from one category to another. Thanks to our research on Pashto verbs, we could identify four main trends of change, displaying as morphologic regularization, syntactic simplification, morphologic differentiation, and semantic clarification.

中文翻译：

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普什图语部首简单动词和语言边界

本文旨在关注当代普什图语口语系统中的语言边界概念，普什图语是一种主要在阿富汗和巴基斯坦使用的伊朗语。对不同普什图语方言中使用的部首简单动词进行仔细、系统和详细的分析后，我们注意到这些动词中有三分之一存在一定程度的变化，它们正在从一个类别切换到另一个类别。由于我们对普什图语动词的研究，我们可以确定四种主要的变化趋势，表现为形态规则化、句法简化、形态分化和语义澄清。