| Simple | Progressive | Perfect | Progressive |
| Present |
| I authenticate |
| you authenticate |
| he/she/it authenticates |
| we authenticate |
| you all authenticate |
| they authenticate |
|
| I am authenticating |
| you are authenticating |
| he/she/it is authenticating |
| we are authenticating |
| you all are authenticating |
| they are authenticating |
|
| I have authenticated |
| you have authenticated |
| he/she/it has authenticated |
| we have authenticated |
| you all have authenticated |
| they have authenticated |
|
| I have been authenticating |
| you have been authenticating |
| he/she/it has been authenticating |
| we have been authenticating |
| you all have been authenticating |
| they have been authenticating |
|
| Past |
| I authenticated |
| you authenticated |
| he/she/it authenticated |
| we authenticated |
| you all authenticated |
| they authenticated |
|
| I was authenticating |
| you were authenticating |
| he/she/it was authenticating |
| we were authenticating |
| you all were authenticating |
| they were authenticating |
|
| I had authenticated |
| you had authenticated |
| he/she/it had authenticated |
| we had authenticated |
| you all had authenticated |
| they had authenticated |
|
| I had been authenticating |
| you had been authenticating |
| he/she/it had been authenticating |
| we had been authenticating |
| you all had been authenticating |
| they had been authenticating |
|
| Future |
| I will authenticate |
| you will authenticate |
| he/she/it will authenticate |
| we will authenticate |
| you all will authenticate |
| they will authenticate |
|
| I will be authenticating |
| you will be authenticating |
| he/she/it will be authenticating |
| we are authenticating |
| you all will be authenticating |
| they will be authenticating |
|
| I will have authenticated |
| you will have authenticated |
| he/she/it will have authenticated |
| we will have authenticated |
| you all will have authenticated |
| they will have authenticated |
|
| I will have been authenticating |
| you will have been authenticating |
| he/she/it will have been authenticating |
| we will have been authenticating |
| you all will have been authenticating |
| they will have been authenticating |
|
