The Verb "Undergo" in English

by Craig Shrives

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Conjugation of "To Undergo"

The verb "undergo" is an irregular verb. (This means that "undergo" does not form its simple past tense or its past participle by adding "-ed" or "-d" to the base form.)

The Five Forms of "To Undergo"

FormundergoAlternative Name
Base FormundergoInfinitive Form
The -S FormundergoesThird Person Singular Form
Past FormunderwentSimple Past Tense
The -ING FormundergoingPresent Participle Form
The Past Participle Formundergone[no alternative name]

"To Undergo" in All the Tenses

The tables below show how "undergo" conjugates in the past, present, and future tenses.

Past Tenses

PersonSimple PastPast Progressive TensePast Perfect TensePast Perfect Progressive Tense
  • I
  • you
  • he/she/it
  • we
  • you
  • they
  • underwent
  • underwent
  • underwent
  • underwent
  • underwent
  • underwent
The simple past tense is for a completed activity that happened in the past.
  • was undergoing
  • were undergoing
  • was undergoing
  • were undergoing
  • were undergoing
  • were undergoing
The past progressive tense is for an ongoing activity in the past. Often, it is used to set the scene for another action.
  • had undergone
  • had undergone
  • had undergone
  • had undergone
  • had undergone
  • had undergone
The past perfect tense is for emphasizing that an action was completed before another took place.
  • had been undergoing
  • had been undergoing
  • had been undergoing
  • had been undergoing
  • had been undergoing
  • had been undergoing
The past perfect progressive tense is for showing that an ongoing action in the past has ended.

Present Tenses

PersonSimple PresentPresent Progressive TensePresent Perfect TensePresent Perfect Progressive Tense
  • I
  • you
  • he/she/it
  • we
  • you
  • they
  • undergo
  • undergo
  • undergoes
  • undergo
  • undergo
  • undergo
The simple present tense is mostly for a fact or a habit.
  • am undergoing
  • are undergoing
  • is undergoing
  • are undergoing
  • are undergoing
  • are undergoing
The present progressive tense is for an ongoing action in the present.
  • have undergone
  • have undergone
  • has undergone
  • have undergone
  • have undergone
  • have undergone
The present perfect tense is for an action that began in the past. (Often, the action continues into the present.)
  • have been undergoing
  • have been undergoing
  • has been undergoing
  • have been undergoing
  • have been undergoing
  • have been undergoing
The present perfect progressive tense is for a continuous activity that began in the past and continues into the present (or finished very recently).

Future Tenses

PersonSimple FutureFuture Progressive TenseFuture Perfect TenseFuture Perfect Progressive Tense
  • I
  • you
  • he/she/it
  • we
  • you
  • they
  • will undergo
  • will undergo
  • will undergo
  • will undergo
  • will undergo
  • will undergo
The simple future tense is for an action that will occur in the future.
  • will be undergoing
  • will be undergoing
  • will be undergoing
  • will be undergoing
  • will be undergoing
  • will be undergoing
The future progressive tense is for an ongoing action that will occur in the future.
  • will have undergone
  • will have undergone
  • will have undergone
  • will have undergone
  • will have undergone
  • will have undergone
The future perfect tense is for an action that will have been completed at some point in the future.
  • will have been undergoing
  • will have been undergoing
  • will have been undergoing
  • will have been undergoing
  • will have been undergoing
  • will have been undergoing
The future perfect progressive tense is for an ongoing action that will be completed at some specified time in the future.

Most Common Irregular Verbs

The two most common irregular verbs in English are "be" and "have." These pages give more details about these two verbs: Here are the next 10 most common irregular verbs in English:

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See Also

How to improve your spelling The most commonly misspelled words in English Top 10 spelling rules in English Parts of Speech Lists 200 Important Irregular Verbs Role-Play Scenarios for English Learners

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