| Present Tense | Past Tense | Future Tense |
|---|---|---|
| I undergo | I underwent | I shall/will undergo |
| We undergo | We underwent | We shall/will undergo |
| You undergo | You underwent | You will undergo |
| He undergoes | He underwent | He will undergo |
| She undergoes | She underwent | She will undergo |
| It undergoes | It underwent | It will undergo |
| They undergo | They underwent | They will undergo |
| Present Continuous | Past Continuous | Future Continuous |
|---|---|---|
| I am undergoing | I was undergoing | I shall/will be undergoing |
| We are undergoing | We were undergoing | We shall/will be undergoing |
| You are undergoing | You were undergoing | You will be undergoing |
| He is undergoing | He was undergoing | He will be undergoing |
| She is undergoing | She was undergoing | She will be undergoing |
| It is undergoing | It was undergoing | It will be undergoing |
| They are undergoing | They were undergoing | They will be undergoing |
| Present Perfect | Past Perfect | Future Perfect |
|---|---|---|
| I have undergone | I had undergone | I shall/will have undergone |
| We have undergone | We had undergone | We shall/will have undergone |
| You have undergone | You had undergone | You will have undergone |
| He has undergone | He had undergone | He will have undergone |
| She has undergone | She had undergone | She will have undergone |
| It has undergone | It had undergone | It will have undergone |
| They have undergone | They had undergone | They will have undergone |
| Present Perfect Continuous | Past Perfect Continuous | Future Perfect Continuous |
|---|---|---|
| I have been undergoing | I had been undergoing | I shall/will have been undergoing |
| We have been undergoing | We had been undergoing | We shall/will have been undergoing |
| You have been undergoing | You had been undergoing | You will have been undergoing |
| He has been undergoing | He had been undergoing | He will have been undergoing |
| She has been undergoing | She had been undergoing | She will have been undergoing |
| It has been undergoing | It had been undergoing | It will have been undergoing |
| They have been undergoing | They had been undergoing | They will have been undergoing |