The jussive is visible in past negation with lam and second-person prohibition with lā.
VerbAfter لَمْWith prohibitive لا
دَعَالَمْ يَدْعُلا تَدْعُ
رَضِيَلَمْ يَرْضَلا تَرْضَ
رَمَىلَمْ يَرْمِلا تَرْمِ
تَلَقَّىلَمْ يَتَلَقَّلا تَتَلَقَّ
The short final ḍammah, kasrah or fatḥah is meaningful evidence left by weak-letter elision and the underlying morphological pattern.
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Defective Verbs: Six Iʿlāl Rules and Four Short Paradigms
The jussive is visible in past negation with lam and second-person prohibition with lā.
VerbAfter لَمْWith prohibitive لا
دَعَالَمْ يَدْعُلا تَدْعُ
رَضِيَلَمْ يَرْضَلا تَرْضَ
رَمَىلَمْ يَرْمِلا تَرْمِ
تَلَقَّىلَمْ يَتَلَقَّلا تَتَلَقَّ
The short final ḍammah, kasrah or fatḥah is meaningful evidence left by weak-letter elision and the underlying morphological pattern.