Mā ajmala an yukrama al-ḍayfu: an + passive subjunctive yields an interpreted maṣdar functioning as the admired event; al-ḍayfu is the nominative passive subject.
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A Passive Example Using an Interpreted Masdar
The Two Exclamatory Verbs: Forms, Rules and Parsing
Mā ajmala an yukrama al-ḍayfu: an + passive subjunctive yields an interpreted maṣdar functioning as the admired event; al-ḍayfu is the nominative passive subject.