Do not misidentify this additional an as the usual infinitival particle that makes an imperfect subjunctive. Jāʾa is a built past form.
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No Jussive Caused by Added An
Additional Particles: Seven Forms, Emphasis and Syntactic Case
Do not misidentify this additional an as the usual infinitival particle that makes an imperfect subjunctive. Jāʾa is a built past form.