"Worse" is an adjective and so doesn't have a past tense.
The word you ask about is : write. The past tense of it is wrote, and the past participle is written.
Yes, begun is a past participle of the word 'begin'.
The word began is the past tense of begin.The past participle form is begun (e.g. past perfect is had begun).
The simple past and past participle are both canceled.
The past tense of "worse" is "worsened" and the past participle is also "worsened."
The past participle of the word "have" is "had."
"Worse" is an adjective and so doesn't have a past tense.
The past participle of the word "do" is "done."
The past participle of the word "Find" is the word "Found."
The past participle of the word "pick" is "picked".
The past participle of the word "finish" is "finished."
The past participle of the word 'fall' is 'fallen'.
The past participle of the word "swore" is "sworn."
The word "invited" is the past participle of invite.
The past participle of the word "hop" is "hopped."
The past participle for the word "welcome" is "welcomed."