لَنْ negates a future action and governs the subjunctive. Weak-final verbs exhibit its effect through different endings:
لَنْ يَدْعُوَ — he will not call.
لَنْ يَدْعُوَا — the two will not call.
لَنْ يَدْعُوا — the men will not call.
لَنْ تَدْعِي — you (feminine singular) will not call.
On singular يَدْعُو, a final fatḥah is visible. In the five-verb forms the final nūn is omitted instead. These are different surface realizations of the same grammatical governance.
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The Particle لَنْ: Negation and Subjunctive
Defective Wāw Verb: Full Paradigm of دَعَا يَدْعُو with Morphological Explanations
لَنْ negates a future action and governs the subjunctive. Weak-final verbs exhibit its effect through different endings:
لَنْ يَدْعُوَ — he will not call.
لَنْ يَدْعُوَا — the two will not call.
لَنْ يَدْعُوا — the men will not call.
لَنْ تَدْعِي — you (feminine singular) will not call.
On singular يَدْعُو, a final fatḥah is visible. In the five-verb forms the final nūn is omitted instead. These are different surface realizations of the same grammatical governance.