Past simple and past participle
undergo
Undergo is an irregular verb: its past simple is underwent and its past participle is undergone.
- Base form
- undergo
- Past simple
- underwent
- Past participle
- undergone
- Definition
- Experience or be subjected to (something, typically something unpleasant, painful, or arduous).
- Example
- “The baby underwent a life-saving brain operation.”
- CEFR level
- C1On the CEFR scale, from A1 (beginner) to C2 (proficient).
- Pattern
- The three forms are different, like begin, began, begun.