On grammatical class:

ba'u
discursive: exaggeration - accuracy - understatement.
da'i
discursive: supposing - in fact.
do'a
discursive: generously - parsimoniously.
je'u
discursive: truth - falsity.
ke'u
discursive: repeating - continuing.
la'a
discursive: probability - improbability.
li'a
discursive: clearly - obscurely.
mu'a
discursive: for example - omitting - end examples.
pa'e
discursive: justice - prejudice.
ra'u
discursive: chiefly - equally - incidentally.
sa'e
discursive: precisely speaking - loosely speaking.
sa'u
discursive: simply - elaborating.
ta'o
discursive: by the way - returning to main point.
to'u
discursive: in brief - in detail.
va'i
discursive: in other words - in the same words.
zu'u
discursive: on the one hand - on the other hand.
fu'au
discursive: luckily - not pertaining to luck - unluckily.
je'au
discursive: correcting/corrective/correction - inattentive/uncaring/neutral toward the presence of possible errors - permitting (known/likely/plausible) errordiscursive: correcting/corrective/correction - inattentive/uncaring/neutral toward the presence of possible errors - permitting (known/likely/plausible) error/incompleteness/approximation
ta'ei
discursive: reconsideration of statement - continuing (on) in that line of thought/discussion