Bought
By is not a verb so it doesn't have a past form Buy is a verb. The past of buy is bought
Bought
the past test of buy is bought
Sat is a past form. Sat is the past form of the verb sit.Sat is a past form. Sat is the past form of the verb sit.Sat is a past form. Sat is the past form of the verb sit.Sat is a past form. Sat is the past form of the verb sit.Sat is a past form. Sat is the past form of the verb sit.Sat is a past form. Sat is the past form of the verb sit.Sat is a past form. Sat is the past form of the verb sit.Sat is a past form. Sat is the past form of the verb sit.Sat is a past form. Sat is the past form of the verb sit.
The past and past participle for "buy" is "bought."
The past particle of "buy" is "bought".
The past indicative and past participle of "buy" are both "bought".
The past tense of buy is bought.
Past tenses can be very confusing, because as you noted, the negative form is different from the past participle. Here are some examples of the two different ways to make the past tense: I bought (irregular past); I did not buy. I gave (another irregular past); I did not give. I sang; I did not sing.
The past participle of buy is bought.
what is the past form of forgive
infinitive: buy past: bought past participle: bought