يَكْتُبُ — لَنْ يَكْتُبَ — لَمْ يَكْتُبْ
Yaktubu is indicative, lan yaktuba is subjunctive, and lam yaktub is jussive. First determine the governor, then the form-specific ending.
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Identify the Governor First
Four Patterns of Imperfect Mood Marking
يَكْتُبُ — لَنْ يَكْتُبَ — لَمْ يَكْتُبْ
Yaktubu is indicative, lan yaktuba is subjunctive, and lam yaktub is jussive. First determine the governor, then the form-specific ending.