why do I have to write this without 'se'?
Because the "and" is already written as the accent above the "i" in "kepi"
Is kepī the nominative with the ipmlied "and"? I don't get the difference between kepi and kepī
Kepi = fathers in nominative case
Kepī can be either "and fathers" (nominative or accusative) or just "fathers" in accusative case.
Can it be "the men are fathers"?
"Vali kepi issi"