Uktubānni al-jawāba: dual imperative with dual alif subject marker, heavy emphatic nūn after alif taking kasra, plus direct object.
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Parsing the Dual Emphatic Form
The Two Emphatic Nūns: Forms and Rules
Uktubānni al-jawāba: dual imperative with dual alif subject marker, heavy emphatic nūn after alif taking kasra, plus direct object.