سَيَكْتُبُ — سَوْفَ يَكْتُبُ — لَنْ يَكْتُبَ
All three can refer to the future, but sa-/sawfa forms remain indicative while lan makes the verb subjunctive. Tense reference does not alone determine mood.
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Future Meaning Does Not Require Subjunctive
The Indicative Imperfect and Its Governor
سَيَكْتُبُ — سَوْفَ يَكْتُبُ — لَنْ يَكْتُبَ
All three can refer to the future, but sa-/sawfa forms remain indicative while lan makes the verb subjunctive. Tense reference does not alone determine mood.