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.
قَضَيَ → قَضَى Past: heقَضَيَتْ → قَضَتْ Past: sheقَضَيُوا → قَضَوْا Past: they (m.)يَقْضِيُ → يَقْضِي Present: he