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.
اِصْطَيَدَ → اِصْطَادَ Past: heاِصْطَيَدَتْ → اِصْطَادَتْ Past: sheاِصْطَيَدْتَ → اِصْطَدْتَ Past: you (m.)اِصْطَيَدْتُ → اِصْطَدْتُ Past: I