On grammatical class:

la'oi
single-word non-Lojban name; quotes a single non-Lojban word delimited by pauses and treats it as a name
ra'oi
single-word rafsi quote; quotes a single word delimited by pauses (in speech) or whitespace (in writing) and treats it as a rafsi
zo'oi
quote next non-Lojban word only; quotes a single non-Lojban word delimited by pauses (in speech) or whitespace (in writing)