> I put the following proposal to you. An early form of PIE did have thethe commonest form of verbal root formation in PIE.
> vowels *i and *u. However, when stressed these vowels diphthongized to
> *ei and *eu. Thus the zero grades represent the original forms. In
> this light verbal roots in *u and *i are easy to find since the
> zero-grade represents the actual vocalic structure.
> In the verbal form of *CVC, *V is a stress-accented *é. *CéC is
> Presumably, then, as a verbal root, *CVC should really be notated*C'VC.
> If we assume that *V = *i as well as *e/*o/*ø, since the commonest(only) verbal pattern calls for *'V, we should expect **CíC not *CeiC,
> Your proposal initially necessitates changing the verbal patternof *C'VC to *CVC(') whenever *V is *i or *u then secondarily erasing