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.
مَشَيَ → مَشَى Past: heمَشَيَتْ → مَشَتْ Past: sheمَشَيُوا → مَشَوْا Past: they (m.)يَمْشِيُ → يَمْشِي Present: he