| I | toughen |
| you | toughen |
| he/she/it | toughens |
| we | toughen |
| you | toughen |
| they | toughen |
| I | have toughened |
| you | have toughened |
| he/she/it | has toughened |
| we | have toughened |
| you | have toughened |
| they | have toughened |
| I | toughened |
| you | toughened |
| he/she/it | toughened |
| we | toughened |
| you | toughened |
| they | toughened |
| I | had toughened |
| you | had toughened |
| he/she/it | had toughened |
| we | had toughened |
| you | had toughened |
| they | had toughened |
| I | will toughen |
| you | will toughen |
| he/she/it | will toughen |
| we | will toughen |
| you | will toughen |
| they | will toughen |
| I | will have toughened |
| you | will have toughened |
| he/she/it | will have toughened |
| we | will have toughened |
| you | will have toughened |
| they | will have toughened |
| I | am toughening |
| you | are toughening |
| he/she/it | is toughening |
| we | are toughening |
| you | are toughening |
| they | are toughening |
| I | have been toughening |
| you | have been toughening |
| he/she/it | has been toughening |
| we | have been toughening |
| you | have been toughening |
| they | have been toughening |
| I | was toughening |
| you | were toughening |
| he/she/it | was toughening |
| we | were toughening |
| you | were toughening |
| they | were toughening |
| I | had been toughening |
| you | had been toughening |
| he/she/it | had been toughening |
| we | had been toughening |
| you | had been toughening |
| they | had been toughening |
| I | will be toughening |
| you | will be toughening |
| he/she/it | will be toughening |
| we | will be toughening |
| you | will be toughening |
| they | will be toughening |
| I | will have been toughening |
| you | will have been toughening |
| he/she/it | will have been toughening |
| we | will have been toughening |
| you | will have been toughening |
| they | will have been toughening |
| I | would toughen |
| you | would toughen |
| he/she/it | would toughen |
| we | would toughen |
| you | would toughen |
| they | would toughen |
| I | would have toughened |
| you | would have toughened |
| he/she/it | would have toughened |
| we | would have toughened |
| you | would have toughened |
| they | would have toughened |
| I | would be toughening |
| you | would be toughening |
| he/she/it | would be toughening |
| we | would be toughening |
| you | would be toughening |
| they | would be toughening |
| I | would have been toughening |
| you | would have been toughening |
| he/she/it | would have been toughening |
| we | would have been toughening |
| you | would have been toughening |
| they | would have been toughening |
| You | toughen |
| we | Let's toughen |
| You | toughen |