The past indicative and past participle of "buy" are both "bought".
Said is already in the past tense. It's the past tense of say.
infinitive: say past: said past participle: said
The past participle of "said" is the same as the past tense, hence it's "said"
Present: say past: said Past Participle: said
The simple past tense and past participle are both said.
Said is already in the past tense. It's the past tense of say.
infinitive: say past: said past participle: said
The past participle of "said" is the same as the past tense, hence it's "said"
Present: say past: said Past Participle: said
The past and past participle for "buy" is "bought."
The simple past tense and past participle are both said.
The past tense of "says" is "said."
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 particle of "buy" is "bought".
"Said" is not an example of past tense; it is the past participle of the verb "say." In past tense, it would be "said."
The past tense of buy is bought.
"Said" is the past tense of the verb "say." It is used to refer to something that was spoken or communicated in the past.