Prohibition uses the second-person imperfect in the jussive after lā al-nāhiyah:
Word / formMeaning / explanation
تُبَعْثِرُ ← لَا تُبَعْثِرْdo not scatter.
تَبْرَنْشِقُ ← لَا تَبْرَنْشِقْdo not become cheerful.
تَتَسَرْبَلُ ← لَا تَتَسَرْبَلْdo not put on a garment.
Each example keeps its morphological pattern. The final imperfect ḍammah becomes sukūn under jussive government. Adding lā directly to the perfect is not how the prohibitive form is built.
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The Four Unaugmented and Augmented Quadriliteral Patterns
Prohibition uses the second-person imperfect in the jussive after lā al-nāhiyah:
Word / formMeaning / explanation
تُبَعْثِرُ ← لَا تُبَعْثِرْdo not scatter.
تَبْرَنْشِقُ ← لَا تَبْرَنْشِقْdo not become cheerful.
تَتَسَرْبَلُ ← لَا تَتَسَرْبَلْdo not put on a garment.
Each example keeps its morphological pattern. The final imperfect ḍammah becomes sukūn under jussive government. Adding lā directly to the perfect is not how the prohibitive form is built.