On grammatical class:

ci'iroi
tense interval modifier: occurs infinite times, eternally; objective tense; defaults as time.
ciroi
tense interval modifier: thrice; objectively quantified tense; defaults as time tense.
du'eroi
tense interval modifier: too many times objective tense, defaults as time tense.
fe'enoroi
location tense interval modifier: never in space; objectively quantified tense.
fe'eroroi
location tense interval modifier: always in space; objectively quantified tense.
mo'aroi
tense interval modifier: too few times; objective tense; defaults as time tense.
noroi
tense interval modifier: never; objectively quantified tense; defaults as time tense.
paroi
tense interval modifier: once; objectively quantified tense; defaults as time tense.
piso'iroi
tense interval modifier: often; objectively quantified tense; defaults as time tense.
piso'uroi
tense interval modifier: rarely; objectively quantified tense; defaults as time tense.
reroi
tense interval modifier: twice; objectively quantified tense; defaults as time tense.
roroi
tense interval modifier: always; objectively quantified tense; defaults as time tense.
so'eroi
tense interval modifier: usually; objectively quantified tense; defaults as time tense.
soi'auroi
almost never/nowhere (default: time sense)
so'iroi
tense interval modifier: many times; objective tense; defaults as time tense.
so'uroi
tense interval modifier: a few times; objective tense; defaults as time tense.
za'ure'u
again; in addition to the first time; for the "more"-th time