Lam yaktubū deletes the mood nūn. Lam yadʿu, lam yarmi and lam yasʿa delete the weak final letter. Both are jussive but have different markers.
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Two Different Jussive Mechanisms
Advanced Parsing Workshop: Integrated Grammar
Lam yaktubū deletes the mood nūn. Lam yadʿu, lam yarmi and lam yasʿa delete the weak final letter. Both are jussive but have different markers.