| Simple | Progressive | Perfect | Progressive |
| Present |
| I certify |
| you certify |
| he/she/it certifies |
| we certify |
| you all certify |
| they certify |
|
| I am certifying |
| you are certifying |
| he/she/it is certifying |
| we are certifying |
| you all are certifying |
| they are certifying |
|
| I have certified |
| you have certified |
| he/she/it has certified |
| we have certified |
| you all have certified |
| they have certified |
|
| I have been certifying |
| you have been certifying |
| he/she/it has been certifying |
| we have been certifying |
| you all have been certifying |
| they have been certifying |
|
| Past |
| I certified |
| you certified |
| he/she/it certified |
| we certified |
| you all certified |
| they certified |
|
| I was certifying |
| you were certifying |
| he/she/it was certifying |
| we were certifying |
| you all were certifying |
| they were certifying |
|
| I had certified |
| you had certified |
| he/she/it had certified |
| we had certified |
| you all had certified |
| they had certified |
|
| I had been certifying |
| you had been certifying |
| he/she/it had been certifying |
| we had been certifying |
| you all had been certifying |
| they had been certifying |
|
| Future |
| I will certify |
| you will certify |
| he/she/it will certify |
| we will certify |
| you all will certify |
| they will certify |
|
| I will be certifying |
| you will be certifying |
| he/she/it will be certifying |
| we are certifying |
| you all will be certifying |
| they will be certifying |
|
| I will have certified |
| you will have certified |
| he/she/it will have certified |
| we will have certified |
| you all will have certified |
| they will have certified |
|
| I will have been certifying |
| you will have been certifying |
| he/she/it will have been certifying |
| we will have been certifying |
| you all will have been certifying |
| they will have been certifying |
|
