إِنْ تَعْمَلْ بِجِدٍّ لَا تَنْدَمْ — إِنْ تَعْمَلْ بِجِدٍّ فَلَا تَنْدَمُ
Without fāʾ, the present-tense result with negative lā is jussive because of the condition. With fāʾ, it may be indicative. Distinguish negative lā from prohibitive lā.
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Negative Lā in a Conditional Answer
The Jussive Imperfect: Governors, Conditions, and Request Responses
إِنْ تَعْمَلْ بِجِدٍّ لَا تَنْدَمْ — إِنْ تَعْمَلْ بِجِدٍّ فَلَا تَنْدَمُ
Without fāʾ, the present-tense result with negative lā is jussive because of the condition. With fāʾ, it may be indicative. Distinguish negative lā from prohibitive lā.