جَاءَ هٰهُنَا رَجُلٌ
A man came here.
Indefiniteness suits a statement in which identifying the particular individual is not essential. “A man came here” reports an occurrence without requiring the hearer to know exactly who the man is.
The speaker may personally know the individual. Indefiniteness concerns how the referent is presented to the audience, not necessarily the speaker’s state of knowledge.
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Al-Ta‘rif wa al-Tankir: Rhetorical Functions of Definiteness and Indefiniteness
جَاءَ هٰهُنَا رَجُلٌ
A man came here.
Indefiniteness suits a statement in which identifying the particular individual is not essential. “A man came here” reports an occurrence without requiring the hearer to know exactly who the man is.
The speaker may personally know the individual. Indefiniteness concerns how the referent is presented to the audience, not necessarily the speaker’s state of knowledge.