يَكْتُبُونَ — لَنْ يَكْتُبُوا — لَمْ يَكْتُبُوا
Category 2 is raised by the retention of nūn and made subjunctive/jussive by dropping nūn. The subject ending itself is retained.
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Category 2: Nūn as the Mood Marker
Four Patterns of Imperfect Mood Marking
يَكْتُبُونَ — لَنْ يَكْتُبُوا — لَمْ يَكْتُبُوا
Category 2 is raised by the retention of nūn and made subjunctive/jussive by dropping nūn. The subject ending itself is retained.