| Simple | Progressive | Perfect | Progressive |
| Present |
| I toughen |
| you toughen |
| he/she/it toughens |
| we toughen |
| you all toughen |
| they toughen |
|
| I am toughening |
| you are toughening |
| he/she/it is toughening |
| we are toughening |
| you all are toughening |
| they are toughening |
|
| I have toughened |
| you have toughened |
| he/she/it has toughened |
| we have toughened |
| you all have toughened |
| they have toughened |
|
| I have been toughening |
| you have been toughening |
| he/she/it has been toughening |
| we have been toughening |
| you all have been toughening |
| they have been toughening |
|
| Past |
| I toughened |
| you toughened |
| he/she/it toughened |
| we toughened |
| you all toughened |
| they toughened |
|
| I was toughening |
| you were toughening |
| he/she/it was toughening |
| we were toughening |
| you all were toughening |
| they were toughening |
|
| I had toughened |
| you had toughened |
| he/she/it had toughened |
| we had toughened |
| you all had toughened |
| they had toughened |
|
| I had been toughening |
| you had been toughening |
| he/she/it had been toughening |
| we had been toughening |
| you all had been toughening |
| they had been toughening |
|
| Future |
| I will toughen |
| you will toughen |
| he/she/it will toughen |
| we will toughen |
| you all will toughen |
| they will toughen |
|
| I will be toughening |
| you will be toughening |
| he/she/it will be toughening |
| we are toughening |
| you all will be toughening |
| they will be toughening |
|
| I will have toughened |
| you will have toughened |
| he/she/it will have toughened |
| we will have toughened |
| you all will have toughened |
| they will have toughened |
|
| I will have been toughening |
| you will have been toughening |
| he/she/it will have been toughening |
| we will have been toughening |
| you all will have been toughening |
| they will have been toughening |
|
