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