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.
أَقْوَمَ → أَقَامَ Past: heأَقْوَمَتْ → أَقَامَتْ Past: sheأَقْوَمْتَ → أَقَمْتَ Past: you (m.)أَقْوَمْتُ → أَقَمْتُ Past: I