Ramā (root r-m-y) is weak-final. In the feminine perfect ramat, the final alif of the masculine form is lost before feminine tāʾ.
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From Ramā to Ramat
Feminine Tāʾ in the Past Tense: Form and Agreement
Ramā (root r-m-y) is weak-final. In the feminine perfect ramat, the final alif of the masculine form is lost before feminine tāʾ.