Я купил спелый персик на рынке.

I bought a ripe peach at the market.

Breakdown of Я купил спелый персик на рынке.

• я: I
• на: at
• купить: to buy
• рынок: the market

Questions & Answers about Я купил спелый персик на рынке.

Why is it купил, not покупал?

Because купил is the perfective past form of купить, and it presents the action as completed: the speaker bought the peach.

• Я купил спелый персик = I bought a ripe peach / I did buy a ripe peach
• Я покупал спелый персик would usually suggest a different viewpoint, more like:
  • I was buying a ripe peach
  • I used to buy ripe peaches
  • or a focus on the process rather than the completed result

So in a simple statement about one finished purchase, купил is the natural choice.

Why does the verb end in -л?

In Russian, the past tense is usually formed with -л added to the verb stem.

For купить:

• infinitive: купить
• past masculine singular: купил

Past tense in Russian also agrees with gender and number:

• masculine: купил
• feminine: купила
• neuter: купило
• plural: купили

So Я купил means the speaker is male, or is speaking in masculine form.

What if the speaker is female?