| Simple | Progressive | Perfect | Progressive |
| Present |
| I unbutton |
| you unbutton |
| he/she/it unbuttons |
| we unbutton |
| you all unbutton |
| they unbutton |
|
| I am unbuttoning |
| you are unbuttoning |
| he/she/it is unbuttoning |
| we are unbuttoning |
| you all are unbuttoning |
| they are unbuttoning |
|
| I have unbuttoned |
| you have unbuttoned |
| he/she/it has unbuttoned |
| we have unbuttoned |
| you all have unbuttoned |
| they have unbuttoned |
|
| I have been unbuttoning |
| you have been unbuttoning |
| he/she/it has been unbuttoning |
| we have been unbuttoning |
| you all have been unbuttoning |
| they have been unbuttoning |
|
| Past |
| I unbuttoned |
| you unbuttoned |
| he/she/it unbuttoned |
| we unbuttoned |
| you all unbuttoned |
| they unbuttoned |
|
| I was unbuttoning |
| you were unbuttoning |
| he/she/it was unbuttoning |
| we were unbuttoning |
| you all were unbuttoning |
| they were unbuttoning |
|
| I had unbuttoned |
| you had unbuttoned |
| he/she/it had unbuttoned |
| we had unbuttoned |
| you all had unbuttoned |
| they had unbuttoned |
|
| I had been unbuttoning |
| you had been unbuttoning |
| he/she/it had been unbuttoning |
| we had been unbuttoning |
| you all had been unbuttoning |
| they had been unbuttoning |
|
| Future |
| I will unbutton |
| you will unbutton |
| he/she/it will unbutton |
| we will unbutton |
| you all will unbutton |
| they will unbutton |
|
| I will be unbuttoning |
| you will be unbuttoning |
| he/she/it will be unbuttoning |
| we are unbuttoning |
| you all will be unbuttoning |
| they will be unbuttoning |
|
| I will have unbuttoned |
| you will have unbuttoned |
| he/she/it will have unbuttoned |
| we will have unbuttoned |
| you all will have unbuttoned |
| they will have unbuttoned |
|
| I will have been unbuttoning |
| you will have been unbuttoning |
| he/she/it will have been unbuttoning |
| we will have been unbuttoning |
| you all will have been unbuttoning |
| they will have been unbuttoning |
|
