كَتَبَ — كَتَبْتَ — كَتَبُوا — كَتَبْنَ
A decision rule: wāw al-jamāʿah → ḍamm; attached movable nominative pronoun → sukūn; otherwise fatḥ (including estimated fatḥ with final alif).
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Diagnose the Building
The Past Verb: Definition, Building, Conjugation and Parsing
كَتَبَ — كَتَبْتَ — كَتَبُوا — كَتَبْنَ
A decision rule: wāw al-jamāʿah → ḍamm; attached movable nominative pronoun → sukūn; otherwise fatḥ (including estimated fatḥ with final alif).