يَكْتُبُ — لَنْ يَكْتُبَ — لَمْ يَكْتُبْ
Nouns have nominative/accusative/genitive case; imperfect verbs have indicative/subjunctive/jussive mood.
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The Imperfect Has No Genitive Mood
The Imperfect Verb: Recognition, Time, Prefixes and Mood
يَكْتُبُ — لَنْ يَكْتُبَ — لَمْ يَكْتُبْ
Nouns have nominative/accusative/genitive case; imperfect verbs have indicative/subjunctive/jussive mood.