The simple past can be either trod or tread.
(Most commonly trod)
The past participle can be either trodden, trod or tread.
(Most commonly trodden)
The simple past and past participle are both canceled.
The past tense and past participle are both ground.
The word 'worse' is an adjective so doesn't have a past participle. Only verbs have a past tense/past participle.
Won is the past tense and past participle of the verb win.
present: begin past: began past participle: begun
Troadden appears to be the past participle of tread, meaning roughly has walked over or on or across.
The past participle of "am not" is "have not been."
The only one I know is "trodden". It is unusual for a verb to have more than one past participle; the only one I know is "hang", which has both "hung" and "hanged".
The past participle of "do" is "done." The past participle of "have" is "had."
The past tense of "have" is "had," and the past participle is also "had."
The past and past participle for "buy" is "bought."
Being is the present participle. The past participle is been.
The past participle is thought.
Eating is the present participle; eaten is the past participle.
"Did" is the past and "done" is the past participle.
The past participle is had.
The past participle of "do" is "done."