Mismatch: morphosyntax: verbal number
Pluractional verbs are formed by reduplication, and convey a sense of ‘multiple, iterative, frequentative, distributive or extensive action'(p. 423). Some verbs appear, morphologically, to have reduplicated stems, but have no non-reduplicated counterpart (p. 429), and have 'undergone bleaching of the pluractional semantics'(p. 518). These inlcude the verbs for 'grill', 'burn', 'fall out (tooth)', 'recover', 'warn', 'chastise', 'defame', 'ask (a question)', 'invent', 'start' and 'stoop (pp. 519-520).
References
Newman, Paul. 2000. The Hausa language: an encyclopedic reference grammar. New Haven: Yale University Press.