The other day, my greek professor asked me on my opinion of the historial roots of the third person plural of Îµá¼°Î¼Î¯, Îµá¼°ÏƒÎ¯.
What at first occured to me was that is was formed by the stem *es and the personal ending -nti, i.e. *esnti, which then lost the s in the position before the n, ti becomes si, *ensi loses the n and becomes eisi because of compensatory lengthening. (I don't know about the order of the rules, so in no particular order)
when I got home, however, and checked my historical grammar, it said that the third person plural was formed on the stem *s-, that is *senti. This makes as much sense as my original explanation, except one thing: Where did the inital s go? Naturally, it would have become h-, but initial aspirations don't just disappear, do they?
My question, thus, is, how is the third person plural of Îµá¼°Î¼Î¯ formed historically?