| Presente (Present) "alter" | I | alter | |
| Presente continuo (Present Continuous) "alter" | I | am altering | |
| Pasado simple (Simple past) "alter" | I | altered | |
| Pasado continuo (Past Continuous) "alter" | I | was altering | |
| Presente perfecto (Present perfect) "alter" | I | have altered | |
| Presente perfecto continuo (Present perfect continuous) "alter" | I | have been altering | |
| Pasado perfecto (Past perfect) "alter" | I | had altered | |
| Pasado perfecto continuo (Past perfect continuous) "alter" | I | had been altering | |
| Futuro (Future) "alter" | I | will alter | |
| Futuro continuo (Future continuous) "alter" | I | will be altering | |
| Futuro perfecto (Future perfect) "alter" | I | will have altered | |
| Futuro perfecto continuo (Future perfect continuous) "alter" | I | will have been altering |