Grass Koiari (Koiali) is a Papuan language of Papua New Guinea spoken in the inland Port Moresby area.

The rhythm of sentences is affected by the speaker; the two factors being tentative pauses and the application of metrical production rules.

Specifier forms can be singular or plural and be applied to declarative or question sentences.

Specifiers do not occur on certain negatives, modal particles, honorifics, conjunctions, interjections, short answers, and certain verb suffixes.

They function as the predicate in clauses and must occur with a subject; a verb alone cannot serve as a sentence.

Post nominal modifiers consist of most adjectives, demonstratives, quantifiers, and limiters.

subjects precede objects and may be separated from each other and the verb by peripheral arguments and other constituents such as negatives and modals which have locations they need to be in Subjects precede objects, and peripheral arguments and other constituents, such as modals and negatives may separate them from both the verb and each other.

There are two types of clauses in grass koiari and are differentiated by their ability to stand alone as self-contained structures.

Clauses can be connected together to form long chains, the Papuan language equivalent of a paragraph.