Underwent is the past tense of undergo. Undergone is the past participle.
The past tense of 'undergo is 'underwent' I underwent major surgery. The past participle of 'undergo' is 'undergone' After I had undergone major surgery I felt much better,
"Undergo" is the present tense form, while "underwent" is the simple past tense. Use "undergone" as the past participle when paired with a helping verb, such as "has" or "have," to indicate an action that has been completed. For example, "She has undergone surgery" uses "undergone," while "He underwent surgery yesterday" uses "underwent."
The past participle of do is done. The past participle of have is had.
The past participle of am is been. Not does not have a past participle
What is the past participle of do
The past participle of have is had....:) I have had...
Being is the present participle. The past participle is been.
The past participle is had.
The past participle is willed.
The past participle is been.
The past participle is thought.
To isn't a verb and so doesn't have a past participle. The past participle of be is been.