The past tense of buy is bought.
By is not a verb and does not have a past tense. Buy is a verb, and the past tense is bought.
infinitive: buy past: bought past participle: bought
Either "he had cut the cake", or "he cut the cake".
The past tense of buy is bought.
The past participle of buy is bought.
The past and past participle for "buy" is "bought."
The past continuous tense of buy is:I/He/She/It was buying.You/We/They were buying.
The past tense is bought.
"Bought" is the past tense of the verb "to buy".
The word bought is a verb; the past participle, past tense of the verb to buy (buys, buying, bought).I bought a cake for the party.The past participle of a verb is also an adjective, a word to describe a noun.I didn't make the cake, it's a bought cake.
Buy is present tense. Buying is the present participle. The past and past participle is bought.