Katabat carries feminine agreement -t. Katabtu (“I wrote”) and katabti (“you [f.] wrote”) carry a suffixed subject pronoun. Their vowels and preceding stem differ.
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Feminine Tāʾ versus Subject Tāʾ
Feminine Tāʾ in the Past Tense: Form and Agreement
Katabat carries feminine agreement -t. Katabtu (“I wrote”) and katabti (“you [f.] wrote”) carry a suffixed subject pronoun. Their vowels and preceding stem differ.