in Arabic words are commonly formed on the basis of a triliteral root, i.e. a set of three consonants, between which sets of vowels are intercalated. This set of vowels sometimes itself signifies a grammatical category such as 'perfective active'. Furthermore, the structure of words within a single class (or binyan) is identical, in the sense that they have the same prosodic template. Compare the following stems which are formed on the basis of the root ktb 'write', and a particular set of vowels:
binyan Pref.Act. Perf.Pass. Impf.Act. Tmpf.Pass I katab kutib aktub uktab II kattab kuttib u-kattib u-kattab III kaatab kuutib u-kaatib u-kaatab IV ?-aktab ?-uktib u-?-aktib u-?-aktab V ta-kattab tu-kuttib a-ta-kattab u-ta-kattab
McCarthy (1979, 1981) has convincingly shown that nonconcatenative systems can best be accounted for within the framework of Autosegmental Phonology/Morphology. Words such as katab and kutib consist of three morphemes which are represented at autonomous levels or tiers, viz. the root ktb, the perfective active morpheme a and the perfective passive morpheme u-i, respectively, and the binyan I template CVCVC. These words differ from kattab and kuttib in that the latter take the binyan II template CVCCVC.
- McCarthy, J. 1981. A prosodic Theory of Nonconcatenative Morphology, Linguistic Inquiry 12, pp. 373-418
- McCarthy, J. 1979. Formal problems in Semitic phonology and morphology, PhD diss., distr. by Indiana University Linguistics Club. Published by Garland Press, New York, 1985.
- McCarthy, J. and A. Prince 1986. Prosodic Morphology, ms. Univ. of Massachusetts, Brandeis Univ.
- Spencer, A. 1991. Morphological Theory, Blackwell, Oxford.