لَمْ يَذُبَّ — ذُبَّ — لَا تَذُبَّ
Translation: he did not repel; repel; do not repel.
Jussive and command environments impose final-vowel/sukūn constraints. Doubled roots meet these constraints through particular assimilated or unassimilated realizations.
The textbook explains ذُبَّ and لَا تَذُبَّ against their expanded underlying stems. A single visible shaddah does not mean a root consonant has been lost.
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Why the Jussive and Imperative Are Special
Doubled Verbs: Complete Conjugation of ذَبَّ يَذُبُّ, Explanations and Essential Rules
لَمْ يَذُبَّ — ذُبَّ — لَا تَذُبَّ
Translation: he did not repel; repel; do not repel.
Jussive and command environments impose final-vowel/sukūn constraints. Doubled roots meet these constraints through particular assimilated or unassimilated realizations.
The textbook explains ذُبَّ and لَا تَذُبَّ against their expanded underlying stems. A single visible shaddah does not mean a root consonant has been lost.