Daʿā becomes daʿat with the silent feminine suffix. In daʿati al-marʾatu, incidental kasra does not restore the lost final alif.
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Another Weak-Final Past Verb
Feminine Tāʾ in the Past Tense: Form and Agreement
Daʿā becomes daʿat with the silent feminine suffix. In daʿati al-marʾatu, incidental kasra does not restore the lost final alif.