لَنْ يَكْتُبْنَ — لَمْ يَكْتُبْنَ
Lan yaktubna has subjunctive syntactic position; lam yaktubna has jussive position. The verb remains indeclinable on sukūn due to feminine-plural nūn.
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With Nūn al-Niswa: Mood in Position
The Indicative Imperfect and Its Governor
لَنْ يَكْتُبْنَ — لَمْ يَكْتُبْنَ
Lan yaktubna has subjunctive syntactic position; lam yaktubna has jussive position. The verb remains indeclinable on sukūn due to feminine-plural nūn.