Re: [tied] Slavic and Latin imperfects

> Both in Latin and in Slavic, the algorithm seems to be: if the verb
> already has an extension *-a: or *-e:, do nothing, else add *-e:.

The generalisation of -e- in Latin is late. For example, early fourth
declension forms show -i- on i stems. (This survives into Classical Latin
in ibat "he was going", and occasional forms in the poets). So any theory
that had this -e- as an inheritance from PIE must be wrong-headed.

Peter