| Simple | Progressive | Perfect | Progressive |
| Present |
| I fester |
| you fester |
| he/she/it festers |
| we fester |
| you all fester |
| they fester |
|
| I am festering |
| you are festering |
| he/she/it is festering |
| we are festering |
| you all are festering |
| they are festering |
|
| I have festered |
| you have festered |
| he/she/it has festered |
| we have festered |
| you all have festered |
| they have festered |
|
| I have been festering |
| you have been festering |
| he/she/it has been festering |
| we have been festering |
| you all have been festering |
| they have been festering |
|
| Past |
| I festered |
| you festered |
| he/she/it festered |
| we festered |
| you all festered |
| they festered |
|
| I was festering |
| you were festering |
| he/she/it was festering |
| we were festering |
| you all were festering |
| they were festering |
|
| I had festered |
| you had festered |
| he/she/it had festered |
| we had festered |
| you all had festered |
| they had festered |
|
| I had been festering |
| you had been festering |
| he/she/it had been festering |
| we had been festering |
| you all had been festering |
| they had been festering |
|
| Future |
| I will fester |
| you will fester |
| he/she/it will fester |
| we will fester |
| you all will fester |
| they will fester |
|
| I will be festering |
| you will be festering |
| he/she/it will be festering |
| we are festering |
| you all will be festering |
| they will be festering |
|
| I will have festered |
| you will have festered |
| he/she/it will have festered |
| we will have festered |
| you all will have festered |
| they will have festered |
|
| I will have been festering |
| you will have been festering |
| he/she/it will have been festering |
| we will have been festering |
| you all will have been festering |
| they will have been festering |
|
