Am is the present tense, first person singular conjugation of be. The past tense is was, and the past participle is been.
Present tense: am Past tense: was Past participle: been
Present tense: lead Present participle: leading Past tense: led Past participle: led
Present tense: strike Past tense: struck Past participle: struck
Present participle: pulling Past tense: pulled Past participle: pulled
Past tense: bit Present participle: biting Past participle: bitten
The present tense is "come". The past participle is "come", as well. "Came" is the past tense.
Present tense: lead Present participle: leading Past tense: led Past participle: led
Present tense: strike Past tense: struck Past participle: struck
Past tense: bit Present participle: biting Past participle: bitten
Present participle: pulling Past tense: pulled Past participle: pulled
The past participle is done. The simple past tense is did. The present participle is doing.
The past tense and past participle is equipped; equipping is the present participle.
The present tense is "come". The past participle is "come", as well. "Came" is the past tense.
The past tense is brought. The past participle is brought. The present participle is bringing.
Wrote is the past tense, written is the past participle, and writing is the present participle.
Past tense: bound Present participle: binding Past participle: bound
Past tense: rang Present tense: ring Past participle: rung Simple past: rang Present participle: ringing
The present tense is "catch/catches". The past tense and past participle is "caught".