An adjective agrees with its noun; a ḥāl is typically an indefinite accusative. However, definiteness alone is not enough to determine the function. In raʾaytu ar-rajula aṣ-ṣāliḥa, the adjective is attributive, not circumstantial.
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Avoid a Mechanical Definite/Indefinite Rule
Choosing the Correct Parsing: Meaning, Governance and Context
An adjective agrees with its noun; a ḥāl is typically an indefinite accusative. However, definiteness alone is not enough to determine the function. In raʾaytu ar-rajula aṣ-ṣāliḥa, the adjective is attributive, not circumstantial.