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MORPHOLOGY: a process by which an inflected form of a word is formed by changing the vowel of the base. EXAMPLE: in English it is possible to derive the past tense of strong verbs by substituting the base vowel by another vowel: get:got, sing:sang and fall:fell.
LIT. Bloomfield (1933)
Halle, M. & K.P. Mohanan (1985)
Scalise, S. (1984)
Spencer, A. (1991)