لَا يَكْتُبُ — مَا يَكْتُبُ — لَنْ يَكْتُبَ — لَمْ يَكْتُبْ
Negative lā and mā here leave the verb indicative; lan governs subjunctive, and lam governs jussive. Semantics of negation alone is insufficient.
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Negation Alone Does Not Determine Mood
The Indicative Imperfect and Its Governor
لَا يَكْتُبُ — مَا يَكْتُبُ — لَنْ يَكْتُبَ — لَمْ يَكْتُبْ
Negative lā and mā here leave the verb indicative; lan governs subjunctive, and lam governs jussive. Semantics of negation alone is insufficient.