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