Buy is present tense. Buying is the present participle. The past and past participle is bought.
The simple past tense and past participle forms are both bought.
infinitive: buy past: bought past participle: bought
The past tense is was or were.The past participle is been.
infinitive: buy past: bought past participle: bought
Present tense: lead Present participle: leading Past tense: led Past participle: led
The past indicative and past participle of "buy" are both "bought".
The past tense of "being" is "was" and the past participle is "been."
The simple past tense is did. The past participle is done.
The past tense of "has" is "had" and the past participle is also "had."
The past tense of "have" is "had" and the past participle is also "had."
The past tense and past participle are both had.