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.
خَشِيُوا → خَشُوا Past: they (m.)يَخْشَيُ → يَخْشَى Present: heأَخْشَيُ → أَخْشَى Present: Iيَخْشَيُونَ → يَخْشَوْنَ Present: they (m.)