| I | impair | 
|---|---|
| you | impair | 
| he/she/it | impairs | 
| we | impair | 
| you | impair | 
| they | impair | 
| I | impaired | 
|---|---|
| you | impaired | 
| he/she/it | impaired | 
| we | impaired | 
| you | impaired | 
| they | impaired | 
| I | have | impaired | 
|---|---|---|
| you | have | impaired | 
| he/she/it | has | impaired | 
| we | have | impaired | 
| you | have | impaired | 
| they | have | impaired | 
| I | had | impaired | 
|---|---|---|
| you | had | impaired | 
| he/she/it | had | impaired | 
| we | had | impaired | 
| you | had | impaired | 
| they | had | impaired | 
