> Thank you, Peter. What about the change of kw to t in Greek and Slavic
> (Greek pente, Slavic pet''). Any ideas?
Mycenaean Greek shows /q/ for kw in all cases. This means that any later
changes are internal to Greek, and if they also occur elsewhere, that is
coincidence.
Most later Greek dialects show:
kW > t before a front vowel (hence pente < penkWe)
but kW > p elsewhere, occasionally k
Similarly, *gW > d or b or g, gWH > th or ph or kh
I can't give details about Slavic, but I do know the change *kW > t is not
regular there. There's a later process by which this has happened in this
word.
Peter