"Use" is a regular verb; therefore, its past participle is "used".
The past participle form of the word "use" is "used."
The past participle is had.
Done is the past participle.
The past participle of the word "Find" is the word "Found."
The past participle of the word "pick" is "picked".
The past participle form of the word "use" is "used."
"ridden" is the past participle of "rode"
The past participle is had.
Done is the past participle.
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."
Said.
The word "invited" is the past participle of invite.
The past participle of "swear" is "sworn."
The past participle of the word 'fall' is 'fallen'.
The simple past and past participle are both welcomed.