ضَرَبَتْ — ضَرَبْتُ
The feminine marker -at is not a subject pronoun. The first-person -tu is an attached nominative subject pronoun and triggers sukūn.
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Do Not Confuse Two Tāʾs
The Past Verb: Definition, Building, Conjugation and Parsing
ضَرَبَتْ — ضَرَبْتُ
The feminine marker -at is not a subject pronoun. The first-person -tu is an attached nominative subject pronoun and triggers sukūn.