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