605. Perfects and Perfect Participles of two syllables have the first syllable long.
iūvī, iūtum (iŭvō)
vīdī, vīsum (vĭdeō)
fūgī (fŭgiō)
vēnī (vĕniō)
Exceptions—
bĭbī, dĕdī, fĭdī, scĭdī, stĕtī, stĭtī, tŭlī
cĭtum, dătum, ĭtum, lĭtum, quĭtum, rătum, rŭtum, sătum, sĭtum, stătum
In some compounds of stō, stātum is found (long).
praestātum
a. In reduplicated Perfects the vowel of the reduplication is short; the vowel of the following syllable is, also, usually short.
cĕcĭdī (cădō)
dĭdĭcī (discō)
pŭpŭgī (pungō)
cŭcŭrrī (currō)
tĕtĕndī (tendō)
mŏmŏrdī (mordeō)
BUT,
cĕcīdī from caedō
pepēdī from pēdō
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