Common mistakes
The middle radical is و or ي. It stretches into a long vowel: قَالَ: and shortens before a consonant ending and in the jussive: قُلْتُ, لَمْ يَقُلْ.
نَوِمَ → نَامَ Past: heنَوِمَتْ → نَامَتْ Past: sheنَوِمْتَ → نِمْتَ Past: you (m.)نَوِمْتُ → نِمْتُ Past: I