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The paper discusses phonologically motivated gaps in inflectional paradigms. A model is offered in which the appearance of gaps is based on a tension between markedness constraints, faithfulness constraints, and constraints which require the expression of morphological categories. After presenting the model, additional implications are analyzed. Situations in which the same problem has different solutions in different morphological contexts are predicted insofar as constraints requiring the expression of different categories can vary in their ranking relative to some faithfulness constraint. Hence, the same phonotactic problem can yield a gap in one situation and a repair in another. This prediction is illustrated and further details of the prediction are explored, including the identification of a situation requiring a more restrictive version of the model. This is achieved by drawing on Smith's (2001) proposal that faithfulness constraints can be indexed to lexical categories to model this situation. [ABSTRACT FROM AUTHOR]

The term morphological reversal describes the situation where the members of a morphological opposition switch their functions in some context (as with Hebrew gender marking, where -Ø∼-a marks masculine∼feminine with adjectives but feminine∼-masculine with numerals). There is a long tradition of polemic against the notion that morphology can encode systematic reversals, and an equally long tradition of reintroducing them under different names (e.g. polarity, exchange rules or morphosyntactic toggles). An examination of some unjustly neglected examples (number in Nehan, aspect in Tübatulabal, tense in Trique and argument marking in Neo-Aramaic) confirms the existence of morphological reversal, particularly as a mechanism of language change. This is strong evidence for the separateness of morphological paradigms from the features that they encode. [ABSTRACT FROM AUTHOR]