The past tense of toughen is toughened
| Infinitive | to toughen |
| Present Tense | toughen / toughens |
| Past Tense | toughened |
| Present Participle | toughening |
| Past Participle | toughened |
| Singular | Plural |
|---|---|
| I toughen | We toughen |
| You toughen | You toughen |
| He/She/It toughens | They toughen |
| Singular | Plural |
|---|---|
| I am toughening | We are toughening |
| You are toughening | You are toughening |
| He/She/It is toughening | They are toughening |
| Singular | Plural |
|---|---|
| I have toughened | We have toughened |
| You have toughened | You have toughened |
| He/She/It has toughened | They have toughened |
| Singular | Plural |
|---|---|
| I have been toughening | We have been toughening |
| You have been toughening | You have been toughening |
| He/She/It has been toughening | They have been toughening |
| Singular | Plural |
|---|---|
| I toughened | We toughened |
| You toughened | You toughened |
| He/She/It toughened | They toughened |
| Singular | Plural |
|---|---|
| I was toughening | We were toughening |
| You were toughening | You were toughening |
| He/She/It was toughening | They were toughening |
| Singular | Plural |
|---|---|
| I had toughened | We had toughened |
| You had toughened | You had toughened |
| He/She/It had toughened | They had toughened |
| Singular | Plural |
|---|---|
| I had been toughening | We had been toughening |
| You had been toughening | You had been toughening |
| He/She/It had been toughening | They had been toughening |
| Singular | Plural |
|---|---|
| I will toughen | We will toughen |
| You will toughen | You will toughen |
| He/She/It will toughen | They will toughen |
| Singular | Plural |
|---|---|
| I will be toughening | We will be toughening |
| You will be toughening | You will be toughening |
| He/She/It will be toughening | They will be toughening |
| Singular | Plural |
|---|---|
| I will have toughened | We will have toughened |
| You will have toughened | You will have toughened |
| He/She/It will have toughened | They will have toughened |
| Singular | Plural |
|---|---|
| I will have been toughening | We will have been toughening |
| You will have been toughening | You will have been toughening |
| He/She/It will have been toughening | They will have been toughening |
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