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