Inna takes a dual accusative marked by yāʾ. Yaktubāni retains nūn because no mood governor affects the verb; the dual alif is its subject and the clause is khabar inna.
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Comprehensive Review: Applied Arabic Parsing
Inna takes a dual accusative marked by yāʾ. Yaktubāni retains nūn because no mood governor affects the verb; the dual alif is its subject and the clause is khabar inna.