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The analytical goal of this paper is to provide a treatment of number and aspect as syntactic properties of the Tohono 'O'odham sign. It situates duplication (one of the phonological expressions of syntactic number) and subtraction (one of the phonological expressions of aspect) within this treatment. Morphological analysis might be easier if there were a one-to-one relationship between grammatical notion and phonological expression--if, for example, 'plural' number in Language-L were always and only associated with the presence of the morph Z. Whether the investigation begins with 'plural' or with Z, it would cover the same ground. However, the properties of Tohono 'O'odham morphology, where duplication is only one of the expressions of syntactic number and subtraction only one of the expressions of aspect, are relatively common. This paper argues, therefore, that the grammatical notion, not the phonological expression, provides the appropriate starting point for morphological analysis. [ABSTRACT FROM AUTHOR]