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