The sentence serves a metalinguistic function by discussing language structure and grammar.
The communicative function of the given sentence is metalinguistic, meaning it involves discussing language itself.
In this case, the sentence analyzes the conjugation of the verb argüir in different grammatical contexts to explain a specific linguistic rule.
By highlighting how the verb behaves in different conjugations, the speaker is commenting on the structure and grammar of the Spanish language, which is a metalinguistic function.
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