The past tense of underdo is underdid
| Infinitive | to underdo |
| Present Tense | underdo / underdoes |
| Past Tense | underdid |
| Present Participle | underdoing |
| Past Participle | underdone |
| Singular | Plural |
|---|---|
| I underdo | We underdo |
| You underdo | You underdo |
| He/She/It underdoes | They underdo |
| Singular | Plural |
|---|---|
| I am underdoing | We are underdoing |
| You are underdoing | You are underdoing |
| He/She/It is underdoing | They are underdoing |
| Singular | Plural |
|---|---|
| I have underdone | We have underdone |
| You have underdone | You have underdone |
| He/She/It has underdone | They have underdone |
| Singular | Plural |
|---|---|
| I have been underdoing | We have been underdoing |
| You have been underdoing | You have been underdoing |
| He/She/It has been underdoing | They have been underdoing |
| Singular | Plural |
|---|---|
| I underdid | We underdid |
| You underdid | You underdid |
| He/She/It underdid | They underdid |
| Singular | Plural |
|---|---|
| I was underdoing | We were underdoing |
| You were underdoing | You were underdoing |
| He/She/It was underdoing | They were underdoing |
| Singular | Plural |
|---|---|
| I had underdone | We had underdone |
| You had underdone | You had underdone |
| He/She/It had underdone | They had underdone |
| Singular | Plural |
|---|---|
| I had been underdoing | We had been underdoing |
| You had been underdoing | You had been underdoing |
| He/She/It had been underdoing | They had been underdoing |
| Singular | Plural |
|---|---|
| I will underdo | We will underdo |
| You will underdo | You will underdo |
| He/She/It will underdo | They will underdo |
| Singular | Plural |
|---|---|
| I will be underdoing | We will be underdoing |
| You will be underdoing | You will be underdoing |
| He/She/It will be underdoing | They will be underdoing |
| Singular | Plural |
|---|---|
| I will have underdone | We will have underdone |
| You will have underdone | You will have underdone |
| He/She/It will have underdone | They will have underdone |
| Singular | Plural |
|---|---|
| I will have been underdoing | We will have been underdoing |
| You will have been underdoing | You will have been underdoing |
| He/She/It will have been underdoing | They will have been underdoing |
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