Prohibition: لَا and the Jussive

Defective Wāw Verb: Full Paradigm of دَعَا يَدْعُو with Morphological Explanations

Prohibitive لَا governs the jussive of the imperfect and forbids an action:
لَا تَدْعُ — Do not call (m.s.).
لَا تَدْعُوَا — Do not call (dual).
لَا تَدْعُوا — Do not call (m.pl.).
لَا تَدْعِي — Do not call (f.s.).

AddresseeActive prohibition
أنتَلَا تَدْعُ
أنتمالَا تَدْعُوَا
أنتملَا تَدْعُوا
أنتِلَا تَدْعِي
أنتنلَا تَدْعُونَ

The masculine singular loses final root wāw as with jussive لَمْ تَدْعُ, but its speech function is prohibition rather than past negation.