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