| Simple | Progressive | Perfect | Progressive |
| Present |
| I impair |
| you impair |
| he/she/it impairs |
| we impair |
| you all impair |
| they impair |
|
| I am impairing |
| you are impairing |
| he/she/it is impairing |
| we are impairing |
| you all are impairing |
| they are impairing |
|
| I have impaired |
| you have impaired |
| he/she/it has impaired |
| we have impaired |
| you all have impaired |
| they have impaired |
|
| I have been impairing |
| you have been impairing |
| he/she/it has been impairing |
| we have been impairing |
| you all have been impairing |
| they have been impairing |
|
| Past |
| I impaired |
| you impaired |
| he/she/it impaired |
| we impaired |
| you all impaired |
| they impaired |
|
| I was impairing |
| you were impairing |
| he/she/it was impairing |
| we were impairing |
| you all were impairing |
| they were impairing |
|
| I had impaired |
| you had impaired |
| he/she/it had impaired |
| we had impaired |
| you all had impaired |
| they had impaired |
|
| I had been impairing |
| you had been impairing |
| he/she/it had been impairing |
| we had been impairing |
| you all had been impairing |
| they had been impairing |
|
| Future |
| I will impair |
| you will impair |
| he/she/it will impair |
| we will impair |
| you all will impair |
| they will impair |
|
| I will be impairing |
| you will be impairing |
| he/she/it will be impairing |
| we are impairing |
| you all will be impairing |
| they will be impairing |
|
| I will have impaired |
| you will have impaired |
| he/she/it will have impaired |
| we will have impaired |
| you all will have impaired |
| they will have impaired |
|
| I will have been impairing |
| you will have been impairing |
| he/she/it will have been impairing |
| we will have been impairing |
| you all will have been impairing |
| they will have been impairing |
|
