| Present "undergo" | I | undergo | |
| Present Continuous "undergo" | I | am undergoing | |
| Simple past "undergo" | I | underwent | |
| Past Continuous "undergo" | I | was undergoing | |
| Present perfect "undergo" | I | have undergone | |
| Present perfect continuous "undergo" | I | have been undergoing | |
| Past perfect "undergo" | I | had undergone | |
| Past perfect continuous "undergo" | I | had been undergoing | |
| Future "undergo" | I | will undergo | |
| Future continuous "undergo" | I | will be undergoing | |
| Future perfect "undergo" | I | will have undergone | |
| Future perfect continuous "undergo" | I | will have been undergoing |