The students came except Khālid. Aṭ-ṭullābu is nominative subject; Khālidan is accusative exception in an affirmative complete construction.
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Case 8: Affirmative Complete Exception
Advanced Parsing Workshop: Integrated Grammar
The students came except Khālid. Aṭ-ṭullābu is nominative subject; Khālidan is accusative exception in an affirmative complete construction.