The addressee imperative is related to the jussive imperfect:
IndicativeJussiveImperative
تَرْمِيلَمْ تَرْمِاِرْمِ
تَرْمِيَانِلَمْ تَرْمِيَااِرْمِيَا
تَرْمُونَلَمْ تَرْمُوااِرْمُوا
تَرْمِينَلَمْ تَرْمِياِرْمِي
The singular masculine loses the final weak letter, while the dual, masculine plural and feminine singular addressee forms lose the indicative nūn. The imperfect prefix is removed and a helping initial vowel/hamzat al-waṣl is supplied where necessary.
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Full Conjugation of the Yāʾ-Final Verb رَمَى يَرْمِي
The addressee imperative is related to the jussive imperfect:
IndicativeJussiveImperative
تَرْمِيلَمْ تَرْمِاِرْمِ
تَرْمِيَانِلَمْ تَرْمِيَااِرْمِيَا
تَرْمُونَلَمْ تَرْمُوااِرْمُوا
تَرْمِينَلَمْ تَرْمِياِرْمِي
The singular masculine loses the final weak letter, while the dual, masculine plural and feminine singular addressee forms lose the indicative nūn. The imperfect prefix is removed and a helping initial vowel/hamzat al-waṣl is supplied where necessary.