For both yarmī and yadʿū, indicative ḍamma is estimated, subjunctive fatḥa is visible, and the jussive deletes the final weak letter.
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Four Patterns of Imperfect Mood Marking
For both yarmī and yadʿū, indicative ḍamma is estimated, subjunctive fatḥa is visible, and the jussive deletes the final weak letter.