لِيَكْتُبْ عَلِيٌّ الدَّرْسَ.
Translation: Let Ali write the lesson.
Command-lām governs yaktub in the jussive; ʿAliyyun is the nominative subject.
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Third Governor: Command-Lām
The Jussive Imperfect: Governors, Conditions, and Request Responses
لِيَكْتُبْ عَلِيٌّ الدَّرْسَ.
Translation: Let Ali write the lesson.
Command-lām governs yaktub in the jussive; ʿAliyyun is the nominative subject.