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.