The present stem is formed from the Root in all regular verbs. Here, Vide, exerce and terre is correct stem.
1. There is exactly ONE present stem of the verb 'video'. For 2nd conjugation verbs like 'video, videre', the present stem is simply the infinitive minus -re, so it's "Vide-".
2. The present stem is simply is the exerce-
3. The present stem is simply is the terre-
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