The tonal inflection of verbs of the Amuzgo language of San Pedro Amuzgos (Oto-Manguean, Mexico) displays a great degree of allomorphy. When faced with allomorphy of this sort, the inflectional class model often reveals an internal logic in a system, but in the case of Amuzgo organizing the inflection into tonal classes results instead in a system which is seemingly chaotic, and somewhat impractical for descriptive purposes. In order to make sense of the apparent chaos, in this paper I pursue an alternative view of the data based on characterizing verbs firstly according to their paradigmatic structure with regard to tonal inflection and then characterizing tonal exponents by way of default and implicative rules of exponence which allow us to comprehend the core of this inflectional system. Having identified this core, I then show how verbs relate to each other on a continuum of morphological complexity.

San Pedro Amuzgos（墨西哥，Oto-Manguean，墨西哥）的Amuzgo语言的动词的音调变化显示出很大的同素度。当面对这种同质异形时，拐点分类模型通常会揭示系统中的内部逻辑，但是在Amuzgo的情况下，将拐点归类为音调类会导致系统看起来是混乱的，并且出于描述目的是不切实际的。为了弄清表面上的混乱，在本文中，我首先根据表征动词的范式结构来表征动词，然后根据默认的和暗示的指数规律表征动词指数，从而寻求数据的另一种观点。这使我们能够理解这个变形系统的核心。确定了这一核心之后，