On grammatical class:

ci'oi
Converts following cmevla or zoi-quote into psychomime.
ki'ai
Converts following cmevla or zoi-quote into a nonce interjection/attitudinal.
sa'ei
Converts following cmevla or zoi-quote into onomatopoeia. (bam! crash! kapow! etc.)
tai'i
Converts following cmevla or zoi-quote into phenomime.