known.
"Knew" is the past tense of "know"; "known" is the past participle.
Formed is the past participle of form.
No. "Running" is a present participle. (As far as I know, no past participle in English ends in the letters "ing").
There is no past participle of knowing.Knowing is the present participle of know. The past participle of know is known
The past participle is known.
Had known is the past participle.
The past participle is relied.
The past participle is laughed.
The past participle is given.
The past participle is worn.
The past form of "am" is "was" and the past participle is "been."
Present participle - developing. Simple past - developed. Past participle - developed.