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.
حَكَيَ → حَكَى Past: heحَكَيَتْ → حَكَتْ Past: sheحَكَيُوا → حَكَوْا Past: they (m.)يَحْكِيُ → يَحْكِي Present: he