The past participle is pushed.
The past particple of push is pushed.
The past participle of "push" is "pushed."
Formed is the past participle of form.
The past participle is laughed.
The past participle is given.
The past participle is worn.
The past participle is relied.
The past form of "am" is "was" and the past participle is "been."
Present participle - developing. Simple past - developed. Past participle - developed.
Sent is the past participle of send.
Introduced is the past participle of introduce.
Past participle: slain or slayed Past form: slew or slayed