Murui is highly synthetic, predominantly suffixing and nominative-accusative. The language is predominantly verb-final; the organization of the constituents in the clause is usually SV/AOV. Grammatical relations are expressed through pronouns cross-referencing on the verb (with one cross-referencing position: the subject S/A). Syntactic functions can be expressed through case markers. Marking of core arguments (S, A, O = non S/A focus) is generally optional and is related to focus; marking of peripheral arguments on an NP (i.e.
locative,
ablative, comitative-instrumental,
benefactive, privative) is usually mandatory. Murui has three open lexical classes (
nouns,
verbs and derived adjectives (that can also be referred to as 'descriptive verbs')). Closed classes of words are underived adjectives and quantifiers, adverbs, pronouns, demonstratives, anaphoric forms, interrogative words, low (1 and 2) and lexicalized (3 < 20) number words, connectives, adpositions, interjections and onomatopoeic forms. The majority of the word classes can occupy the predicate slot but there are restrictions as to what kind of sets of suffixes can be attached to non-verbs. Quantifiers, connectives, adpositions, interjections and onomatopoeic forms cannot function predicatively. One of the most salient characteristics of the nominal morphology of Murui is a large multiple
classifier system that consists of at least 80 classifiers. The same (or almost the same) classifier form can be used in a variety of morphosyntactic contexts (hence the label 'multiple classifier system'). The system is semi-open due to the occurrence of repeaters (partially repeated nouns that occur in classifier slots). All types of classifiers are bound suffixes that can be either mono- or disyllabic. ==See also==