Taʾdīban expresses an intended purpose; jubnan expresses a motive or cause.
Both are accusative reason complements in the source’s treatment. The semantic nuance differs; the syntactic “why?” relationship is shared.
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Two Source Examples, Two Kinds of Motivation
Al-Mafʿūl Lahu: Expressing the Reason for an Action
Taʾdīban expresses an intended purpose; jubnan expresses a motive or cause.
Both are accusative reason complements in the source’s treatment. The semantic nuance differs; the syntactic “why?” relationship is shared.