Ḥaḍara aṭ-ṭullābu illā Khālidan is a complete affirmative exception with an accusative exception. Mā ḥaḍara illā Khālidun is an incomplete negative construction; Khālidun is the nominative subject.
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Complete Exception or Incomplete Negative?
Choosing the Correct Parsing: Meaning, Governance and Context
Ḥaḍara aṭ-ṭullābu illā Khālidan is a complete affirmative exception with an accusative exception. Mā ḥaḍara illā Khālidun is an incomplete negative construction; Khālidun is the nominative subject.