| singular | plural |
| Infinitive | | |
| undergo | |
| present simple | | |
| 1 | I undergo | we undergo |
| 2 | you undergo | you undergo |
| 3 | he/she/it undergoes | they undergo |
| past simple | | |
| 1 | I underwent | we underwent |
| 2 | you underwent | you underwent |
| 3 | he/she/it underwent | they underwent |
| future simple | | |
| 1 | I will/shall undergo | we will/shall undergo |
| 2 | you will/shall undergo | you will/shall undergo |
| 3 | he/she/it will/shall undergo | they will/shall undergo |
| conditional simple | | |
| 1 | I would undergo | we would undergo |
| 2 | you would undergo | you would undergo |
| 3 | he/she/it would undergo | they would undergo |
| present continuous | | |
| 1 | I am undergoing | we are undergoing |
| 2 | you are undergoing | you are undergoing |
| 3 | he/she/it is undergoing | they are undergoing |
| past continuous | | |
| 1 | I was undergoing | we were undergoing |
| 2 | you were undergoing | you were undergoing |
| 3 | he/she/it was undergoing | they were undergoing |
| future continuous | | |
| 1 | I will be undergoing | we will be undergoing |
| 2 | you will be undergoing | you will be undergoing |
| 3 | he/she/it will be undergoing | they will be undergoing |
| conditional continuous | | |
| 1 | I would be undergoing | we would be undergoing |
| 2 | you would be undergoing | you would be undergoing |
| 3 | he/she/it would be undergoing | they would be undergoing |
| present perfect | | |
| 1 | I have undergone | we have undergone |
| 2 | you have undergone | you have undergone |
| 3 | he/she/it has undergone | they have undergone |
| past perfect | | |
| 1 | I had undergone | we had undergone |
| 2 | you had undergone | you had undergone |
| 3 | he/she/it had undergone | they had undergone |
| future perfect | | |
| 1 | I will have undergone | we will have undergone |
| 2 | you will have undergone | you will have undergone |
| 3 | he/she/it will have undergone | they will have undergone |
| conditional perfect | | |
| 1 | I would have undergone | we would have undergone |
| 2 | you would have undergone | you would have undergone |
| 3 | he/she/it would have undergone | they would have undergone |
