| Simple | Progressive | Perfect | Progressive |
| Present |
| I undergo |
| you undergo |
| he/she/it undergoes |
| we undergo |
| you all undergo |
| they undergo |
|
| I am undergoing |
| you are undergoing |
| he/she/it is undergoing |
| we are undergoing |
| you all are undergoing |
| they are undergoing |
|
| I have undergone |
| you have undergone |
| he/she/it has undergone |
| we have undergone |
| you all have undergone |
| they have undergone |
|
| I have been undergoing |
| you have been undergoing |
| he/she/it has been undergoing |
| we have been undergoing |
| you all have been undergoing |
| they have been undergoing |
|
| Past |
| I underwent |
| you underwent |
| he/she/it underwent |
| we underwent |
| you all underwent |
| they underwent |
|
| I was undergoing |
| you were undergoing |
| he/she/it was undergoing |
| we were undergoing |
| you all were undergoing |
| they were undergoing |
|
| I had undergone |
| you had undergone |
| he/she/it had undergone |
| we had undergone |
| you all had undergone |
| they had undergone |
|
| I had been undergoing |
| you had been undergoing |
| he/she/it had been undergoing |
| we had been undergoing |
| you all had been undergoing |
| they had been undergoing |
|
| Future |
| I will undergo |
| you will undergo |
| he/she/it will undergo |
| we will undergo |
| you all will undergo |
| they will undergo |
|
| I will be undergoing |
| you will be undergoing |
| he/she/it will be undergoing |
| we are undergoing |
| you all will be undergoing |
| they will be undergoing |
|
| I will have undergone |
| you will have undergone |
| he/she/it will have undergone |
| we will have undergone |
| you all will have undergone |
| they will have undergone |
|
| I will have been undergoing |
| you will have been undergoing |
| he/she/it will have been undergoing |
| we will have been undergoing |
| you all will have been undergoing |
| they will have been undergoing |
|
