Some irregular Spanish verbs with infinite in "-ir" seem to have an interesting pattern in their conjugation:
For some verbs with "o" as last vowel in the infinite stem (e.g. dormir, morir), the form of the last stem vowel in conjugated forms seem to follow the following pattern (examples are in italics):
stressed: ue (duermo, duerma)
unstressed, next vowel/diphthong i: o (dormimos, dormía)
unstressed, next vowel/diphthong ie/a/ió: u (durmieron, durmamos, durmió)
Similarly for some verbs with last vowel in the infinite stem "e" (e.g. mentir, sentir):
stressed: ie (siento, sienta)
unstressed, next vowel/diphthong i: e (sentimos, sentía)
unstressed, next vowel/diphthong ie/a/ió: i (sintieron, sintamos, sintió)
When looking as the unstressed vowel patterns in particular, this reminds me of vowel harmony.
- Does this qualify as vowel harmony at all?
- If so, where does this phenomenon come from in Spanish? I usually relate vowel harmony to Uralic/Turkic languages, but not IE/romance. Does a similar phenomenon appear in other IE/romance langauges?