| Presente (Present) "alter" | I | alter | |
| Presente Progressivo (Present Continuous) "alter" | I | am altering | |
| Passato semplice (Simple past) "alter" | I | altered | |
| Past Continuous (Past Continuous) "alter" | I | was altering | |
| Regalo perfetto (Present perfect) "alter" | I | have altered | |
| Trapassato prossimo (Present perfect continuous) "alter" | I | have been altering | |
| Passato perfetto (Past perfect) "alter" | I | had altered | |
| Trapassato remoto (Past perfect continuous) "alter" | I | had been altering | |
| Futuro (Future) "alter" | I | will alter | |
| Trapassato remoto (Future continuous) "alter" | I | will be altering | |
| Futuro perfetto (Future perfect) "alter" | I | will have altered | |
| Congiuntivo (Future perfect continuous) "alter" | I | will have been altering |