In weak-final verbs jussive regularly deletes the weak letter: yadʿu/yadʿu, yarmī/yarmi, yasʿā/yasʿa (Arabic endings show the deletion).
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Weak-Final Present Verbs
Comprehensive Review: Applied Arabic Parsing
In weak-final verbs jussive regularly deletes the weak letter: yadʿu/yadʿu, yarmī/yarmi, yasʿā/yasʿa (Arabic endings show the deletion).