The past tense of undergo is underwent
| Infinitive | to undergo |
| Present Tense | undergo / undergoes |
| Past Tense | underwent |
| Present Participle | undergoing |
| Past Participle | undergone |
| Singular | Plural |
|---|---|
| I undergo | We undergo |
| You undergo | You undergo |
| He/She/It undergoes | They undergo |
| Singular | Plural |
|---|---|
| I am undergoing | We are undergoing |
| You are undergoing | You are undergoing |
| He/She/It is undergoing | They are undergoing |
| Singular | Plural |
|---|---|
| I have undergone | We have undergone |
| You have undergone | You have undergone |
| He/She/It has undergone | They have undergone |
| Singular | Plural |
|---|---|
| I have been undergoing | We have been undergoing |
| You have been undergoing | You have been undergoing |
| He/She/It has been undergoing | They have been undergoing |
| Singular | Plural |
|---|---|
| I underwent | We underwent |
| You underwent | You underwent |
| He/She/It underwent | They underwent |
| Singular | Plural |
|---|---|
| I was undergoing | We were undergoing |
| You were undergoing | You were undergoing |
| He/She/It was undergoing | They were undergoing |
| Singular | Plural |
|---|---|
| I had undergone | We had undergone |
| You had undergone | You had undergone |
| He/She/It had undergone | They had undergone |
| Singular | Plural |
|---|---|
| I had been undergoing | We had been undergoing |
| You had been undergoing | You had been undergoing |
| He/She/It had been undergoing | They had been undergoing |
| Singular | Plural |
|---|---|
| I will undergo | We will undergo |
| You will undergo | You will undergo |
| He/She/It will undergo | They will undergo |
| Singular | Plural |
|---|---|
| I will be undergoing | We will be undergoing |
| You will be undergoing | You will be undergoing |
| He/She/It will be undergoing | They will be undergoing |
| Singular | Plural |
|---|---|
| I will have undergone | We will have undergone |
| You will have undergone | You will have undergone |
| He/She/It will have undergone | They will have undergone |
| Singular | Plural |
|---|---|
| I will have been undergoing | We will have been undergoing |
| You will have been undergoing | You will have been undergoing |
| He/She/It will have been undergoing | They will have been undergoing |
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