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