
Irregular verb: undergo - underwent - undergone
| Present | Present continuous | Preterite | Preterite continuous | 
| I undergo you undergo he undergoes we undergo you undergo they undergo | I am undergoing you are undergoing he is undergoing we are undergoing you are undergoing they are undergoing | I underwent you underwent he underwent we underwent you underwent they underwent | I was undergoing you were undergoing he was undergoing we were undergoing you were undergoing they were undergoing | 
| Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
| I have undergone you have undergone he has undergone we have undergone you have undergone they have undergone | I have been undergoing you have been undergoing he has been undergoing we have been undergoing you have been undergoing they have been undergoing | I had undergone you had undergone he had undergone we had undergone you had undergone they had undergone | I had been undergoing you had been undergoing he had been undergoing we had been undergoing you had been undergoing they had been undergoing | 
| Future | Future continuous | Future perfect | Future perfect continuous | 
| I will undergo you will undergo he will undergo we will undergo you will undergo they will undergo | I will be undergoing you will be undergoing he will be undergoing we will be undergoing you will be undergoing they will be undergoing | I will have undergone you will have undergone he will have undergone we will have undergone you will have undergone they will have undergone | I will have been undergoing you will have been undergoing he will have been undergoing we will have been undergoing you will have been undergoing they will have been undergoing | 
| Present | Present continuous | Past | Past continuous | 
| I would undergo you would undergo he would undergo we would undergo you would undergo they would undergo | I would be undergoing you would be undergoing he would be undergoing we would be undergoing you would be undergoing they would be undergoing | I would have undergone you would have undergone he would have undergone we would have undergone you would have undergone they would have undergone | I would have been undergoing you would have been undergoing he would have been undergoing we would have been undergoing you would have been undergoing they would have been undergoing | 
| Infinitive | Imperative | 
| Infinitive | Imperative | ||
| to undergo | undergo Let's undergo undergo | 
| Present | Past | ||
| undergoing | undergone |