Common mistakes
The root ends in و or ي, and the endings themselves change. Three patterns cover it: دَعَا يَدْعُو, رَمَى يَرْمِي and نَسِيَ يَنْسَى.
أَعْطَوَ → أَعْطَى Past: heأَعْطَوَتْ → أَعْطَتْ Past: sheأَعْطَوْتَ → أَعْطَيْتَ Past: you (m.)أَعْطَوْتُ → أَعْطَيْتُ Past: I