| Simple | Progressive | Perfect | Progressive |
| Present |
| I understaff |
| you understaff |
| he/she/it understaffs |
| we understaff |
| you all understaff |
| they understaff |
|
| I am understaffing |
| you are understaffing |
| he/she/it is understaffing |
| we are understaffing |
| you all are understaffing |
| they are understaffing |
|
| I have understaffed |
| you have understaffed |
| he/she/it has understaffed |
| we have understaffed |
| you all have understaffed |
| they have understaffed |
|
| I have been understaffing |
| you have been understaffing |
| he/she/it has been understaffing |
| we have been understaffing |
| you all have been understaffing |
| they have been understaffing |
|
| Past |
| I understaffed |
| you understaffed |
| he/she/it understaffed |
| we understaffed |
| you all understaffed |
| they understaffed |
|
| I was understaffing |
| you were understaffing |
| he/she/it was understaffing |
| we were understaffing |
| you all were understaffing |
| they were understaffing |
|
| I had understaffed |
| you had understaffed |
| he/she/it had understaffed |
| we had understaffed |
| you all had understaffed |
| they had understaffed |
|
| I had been understaffing |
| you had been understaffing |
| he/she/it had been understaffing |
| we had been understaffing |
| you all had been understaffing |
| they had been understaffing |
|
| Future |
| I will understaff |
| you will understaff |
| he/she/it will understaff |
| we will understaff |
| you all will understaff |
| they will understaff |
|
| I will be understaffing |
| you will be understaffing |
| he/she/it will be understaffing |
| we are understaffing |
| you all will be understaffing |
| they will be understaffing |
|
| I will have understaffed |
| you will have understaffed |
| he/she/it will have understaffed |
| we will have understaffed |
| you all will have understaffed |
| they will have understaffed |
|
| I will have been understaffing |
| you will have been understaffing |
| he/she/it will have been understaffing |
| we will have been understaffing |
| you all will have been understaffing |
| they will have been understaffing |
|
