Question: Verb Paradigms

    Has anyone every invented a language that has internal vowel change for
any type of tense/aspect marking on the verb?  I did so once in Megdevi where
changing the short vowels from schwas to [I]'s you got the perfective,
regardless of tense, thus:

?oj dZarabi: I'm eating.
?oj dZIrIbi: I've eaten.

    However, what I'm really interested in is stuff like German and English
with "sing/sang" and "sehe/sah".  I always try to come up with some sort of
language that does things like this, but I'm always disappointed with the
result because it ends looking too regular and/or too artificial.  Are there
any out there?

-Dave

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