Verbal indexing is only available for so-called 'core arguments'. A TB noun phrase is head initial. Both NPs and KPs may be prepositional complements. Nouns characteristically appear inside NPs, are preceded by an article, a preposition or a numeral classifier. Verbs are the class of words that can be prefixed for subject when used as the head of a main clause.
Adjectives are a subclass of the non-agentive intransitive verbs.
The category of adverbs is not discussed in the chapter on word classes, but from the information given elsewhere in the book, it seems to be a separate category which shares some properties with the verbal class. In TB the same word form may be used, with no derivational morphology, in both nominal and verbal frames. In fact, such 'pre-categorial' items constitute the majority of the lexical items in the open word classes. This phenomenon, which is very common in Austronesian languages, has important implications for formal theories that take the lexical categories N and V as fundamentally different. In Tukang Besi there is much more verbal morphology than there is nominal morphology.