On grammatical class:

ji'oi
This cmavo precedes a predicate (at least binary) and turns it into a conjunction, which syntactically behaves like JA cmavo. The predicate indicates the relationship between the two connected propositions. Terminator: {te'u}.
ni'oi
This cmavo precedes a predicate (at least binary) and turns it into an incidental conjunction, which syntactically behaves like JA cmavo. The predicate indicates the relationship between the two connected propositions. Terminator: {te'u}.