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

[petegray]

I said::

[Latin au > o: in "vulgar Latin", but often Romance seems to show au > O]

Nik said:

> Certainly not in Spanish, at any rate.  causa became .../kosa/
> ...not.../kwesa/ .

You could point to Old Spanish coa < cauda, too.    There are cases where
Romance derivatives show an original long o:, but I believe the cases of
short O are more common.

Note that the Latin /au/ survived in Provencal and Rumanian.

Peter