The past tense of "know" is "knew", and the past participle is "known".
The past tense of "fall" is "fell", and the past participle is "fallen".
The past participle of "run" is "run", and the past tense is "ran".
Past tense of "wear" is "wore." The past participle is "worn."
The past tense of "hear" is "heard" and the past participle is also "heard."
The past tense of "lead" is "led," and the past participle is also "led."
The past tense of "fall" is "fell", and the past participle is "fallen".
The past participle of "run" is "run", and the past tense is "ran".
Past tense of "wear" is "wore." The past participle is "worn."
The past tense of "grow" is "grew" and the participle is "grown."
The past tense of "hear" is "heard" and the past participle is also "heard."
The past tense of "lead" is "led," and the past participle is also "led."
The past tense of "build" is "built" and the past participle is also "built."
The past participle of "steal" is "stolen." The past tense of "steal" is also "stole."
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 of "know" is "known."