SOME INDO-EUROPEAN MORPHOLOGICAL ALTERNATIONS

Variation in IE languages between morphemes containing o and yo is found in genitive singular and dative-ablative plural endings, in four non-finite verbal formations, and in the sigmatic future. Suffixation with o was a frequent source of IE adjectives. If the o was added to a noun stem in i or to a locative form ending in i, the resulting yo through re-analysis could itself become a productive suffix. The yo so derived was the basis of three participial formations. The sigmatic future and the Vedic infinitive in -dhyai derived their y from present formations with stems in yo. The genitive singular and dative-ablative plural endings must be otherwise explained.