The past participle is undergone.
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,
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...
Regular verbs follow a consistent pattern when forming their past tense and past participle. For example, the past tense of "walk" is "walked," and the past participle is also "walked." Another example is "jump," where both the past tense and past participle are "jumped." These verbs do not undergo any changes in their form when moving from present to past tense.
Being is the present participle. The past participle is been.
The past participle is been.
The past participle is willed.
The past participle is had.
The past participle is thought.