я не купил

I didn’t buy

→ я
phrase Uncommon #23,289
I didn’t buy Used by a male speaker in the past tense. The verb купил can also mean “bought” in contexts where the subject is understood from the sentence.
RU: Я не купил хлеб по дороге домой.
EN: I didn’t buy bread on the way home.

Я не купил вам подарок на Рождество.

I didn't buy you a Christmas present.

Я не купил их.

I didn’t buy them.

Я не купил яиц.

I didn't buy any eggs.

Я не купил всего, что просил Том.

I didn't buy everything Tom asked for.