Irregular VerbsPast tense of “undergo”: underwent, undergone
The verb “undergo” is irregular: its past simple is “underwent” and its past participle is “undergone”.
Base form (V1)
undergo
/ˌʌndəˈɡəʊ/
Past simple (V2)
underwent
/ˌʌndəˈwɛnt/
Past participle (V3)
undergone
/ˌʌndəˈɡɒn/
Meaning
to go through something hard, like an operation
Example
She underwent a long operation.
Pattern
ABC — all three forms are different
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