Heritage language learners are often only exposed to one dialect or colloquial variety of the heritage language, unlike their monolingual peers who interact with a standard monolingual dialect found in formal instruction.[1] Furthermore, certain grammatical properties are only present in the standard dialect or are used infrequently in the colloquial dialect.[2] Pires and Rothaman use the expression, "missing-input competence divergence," to refer to instances when a grammatical property is missing from the colloquial variety.