1. See Athematic accent / ablaut classes of PIE nouns for examples. 2. But its lack of a nominal categories, thematic and athematic . 3. Athematic verbs appear to be older, and show ablaut within the paradigm.4. The infix itself ablauts like root athematic verbs. 5. For comparison, here is an example of an athematic verb,'be '. 6. In the other Slavic languages, the original ending generally survives except in the athematic verbs. 7. Inflected as the " Narten " athematic type, with lengthened grade in the singular and fixed accent. 8. Athematic verbs, and perfect actives and aorist passives, add the suffix instead, e . g ..9. Consequently, the athematic verbs became a non-productive relic class in the later Indo-European languages. 10. Latin, for example, has only very few athematic verbs, while Sanskrit preserves a large number of these.
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