An argument can be expressed by an overt Noun Phrase [Syntax - 2.1.2.1.] or by a pronoun [Syntax - 2.1.2.2.]. An argument can be cross-referenced by an agreeing [Syntax - 2.1.2.3.] or a classifier predicate [Syntax – 2.1.2.4.]. An argument of a predicate can also be a clause [Syntax – 2.1.2.5.].