Latin verbal system: how perfect and aorist joined in the new pe

[Anthony Appleyard]

I still think that one of the various threads leading to the Latin perfect
with its frequent `v', was contraction of a periphrastic perfect e.g.
*ama;vo:s (IE perfect active participle) + a tense of {es-} = "be", e.g.
amavistis < *{amavor estes}.