| Present "impair" | I | impair | |
| Present Continuous "impair" | I | am impairing | |
| Simple past "impair" | I | impaired | |
| Past Continuous "impair" | I | was impairing | |
| Present perfect "impair" | I | have impaired | |
| Present perfect continuous "impair" | I | have been impairing | |
| Past perfect "impair" | I | had impaired | |
| Past perfect continuous "impair" | I | had been impairing | |
| Future "impair" | I | will impair | |
| Future continuous "impair" | I | will be impairing | |
| Future perfect "impair" | I | will have impaired | |
| Future perfect continuous "impair" | I | will have been impairing |