The past tense of "build" is "built" and the past participle is also "built."
The past tense of "fall" is "fell", and the past participle is "fallen".
The past tense of "know" is "knew", and the past participle is "known".
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 "fall" is "fell", and the past participle is "fallen".
The past tense of "know" is "knew", and the past participle is "known".
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 participle of "steal" is "stolen." The past tense of "steal" is also "stole."
Built is the past participle of build.
The past participle is built.
The past form of "build" is "built" and the past participle is also "built".
infinitive: build past: built past participle: built