However, "isc" isn't a recognized prefix or suffix in Italian grammar. It's possible you're misremembering or misinterpreting something.
Let me explain how verbs related to "being" work in Italian:
1. "Essere" (to be): This is the most common and fundamental verb for expressing existence, state, and identity.
2. "Stare" (to be, to stay, to stand): This verb is often used to describe a temporary or ongoing state, as in "I am feeling sick" (Sto male) or "He is staying at the hotel" (Sta all'hotel).
3. "Sembrare" (to seem): This verb implies an appearance or impression, like "She seems happy" (Sembra contenta).
4. "Diventare" (to become): This verb expresses a change or transformation, like "I am becoming a doctor" (Sto diventando un dottore).
5. "Parere" (to appear, to seem): This verb is similar to "sembrare" but can also be used for subjective opinions, like "It seems good to me" (Mi pare buono).
6. "Rimanere" (to remain, to stay): This verb denotes continuity or persistence, like "He remained silent" (È rimasto zitto).
Please clarify your question if you had something else in mind. Let me know if you'd like to explore other aspects of Italian verbs!