يَكْتُبُ — لَمْ يَكْتُبْ
Yaktubu is indicative; lam yaktub is jussive, shown by final sukūn. Lam negates past occurrence and governs jazm.
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With Lam: The Jussive Takes Over
The Indicative Imperfect and Its Governor
يَكْتُبُ — لَمْ يَكْتُبْ
Yaktubu is indicative; lam yaktub is jussive, shown by final sukūn. Lam negates past occurrence and governs jazm.