| Present "unfasten" | I | unfasten | |
| Present Continuous "unfasten" | I | am unfastening | |
| Simple past "unfasten" | I | unfastened | |
| Past Continuous "unfasten" | I | was unfastening | |
| Present perfect "unfasten" | I | have unfastened | |
| Present perfect continuous "unfasten" | I | have been unfastening | |
| Past perfect "unfasten" | I | had unfastened | |
| Past perfect continuous "unfasten" | I | had been unfastening | |
| Future "unfasten" | I | will unfasten | |
| Future continuous "unfasten" | I | will be unfastening | |
| Future perfect "unfasten" | I | will have unfastened | |
| Future perfect continuous "unfasten" | I | will have been unfastening |