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