An governs the subjunctive: fatḥa for yaktuba, deletion of nūn for yaktubū, and an estimated fatḥa on the final alif of yasʿā.
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Signs After An with Imperfect Verbs
Infinitival Particles: Mā, An and Anna
An governs the subjunctive: fatḥa for yaktuba, deletion of nūn for yaktubū, and an estimated fatḥa on the final alif of yasʿā.