تَلْحَقُ الْمَاضِيَ لِتَدُلَّ عَلَى تَأْنِيثِ مَا أُسْنِدَ إِلَيْهِ الْفِعْلُ
Translation: It attaches to the past tense to mark the femininity of its subject.
The suffix signals that the subject to whom the past action is attributed is feminine. The textbook gives the example ḍarabat Hindun.
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Source Rule: Suffixing the Past Verb
Feminine Tāʾ in the Past Tense: Form and Agreement
تَلْحَقُ الْمَاضِيَ لِتَدُلَّ عَلَى تَأْنِيثِ مَا أُسْنِدَ إِلَيْهِ الْفِعْلُ
Translation: It attaches to the past tense to mark the femininity of its subject.
The suffix signals that the subject to whom the past action is attributed is feminine. The textbook gives the example ḍarabat Hindun.