Ḍarabat: past verb with feminine agreement tāʾ, which has no syntactic case position. Hindun: overt nominative subject; the suffix is not the subject.
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Parsing the Textbook Example
Feminine Tāʾ in the Past Tense: Form and Agreement
Ḍarabat: past verb with feminine agreement tāʾ, which has no syntactic case position. Hindun: overt nominative subject; the suffix is not the subject.