On grammatical class:

bi'u
discursive: newly introduced information - previously introduced information.
jo'a
discursive: metalinguistic affirmer.
kau
discursive: marks word serving as focus of indirect question: "I know WHO went to the store".
li'o
discursive: omitted text (quoted material).
na'i
discursive: metalinguistic negator.
pau
discursive: optional question premarker.
sa'a
discursive: material inserted by editor/narrator (bracketed text).
ta'u
discursive: expanding the tanru - making a tanru.
bi'a
emphasis indicator; indicates the previous word is especially emphasized
ge'ei
metasyntactic variable marker
li'oi
marks word/construct as being optional, i.e. the bridi would still be both grammatical AND reflect the speakers opinion/intention would the marked construct be left out
ra'ei
semi-discursive: and so forth, and so on, et cetera, continuing similarly
uei
discursive: optional answer premarker
uoi
discursive: marks question construct as allowing filling it with answers that are non-referential constructs only
zi'a
nonce-word indicator; indicates previous word is nonce-creation and may be nonstandard
zi'ai
jargon word indicator; indicates previous word is a jargon word