Breakdown of В среду я купил чёрную ручку и серый блокнот для работы.
я
I
купить
to buy
работа
the work
и
and
Questions & Answers about В среду я купил чёрную ручку и серый блокнот для работы.
Why is it в среду and not в среда?
Because в here means on, and with days of the week Russian uses the accusative case.
- Dictionary form: среда = Wednesday
- Accusative singular: среду
So:
- в среду = on Wednesday
This is just the normal pattern:
- в понедельник = on Monday
- в среду = on Wednesday
- в пятницу = on Friday
Why is the verb купил?
Купил is the past tense masculine singular form of купить.
So it tells you two things:
- the action happened in the past
- the speaker is male, or at least the grammatical subject is masculine
Compare:
- я купил = I bought, said by a man
- я купила = I bought, said by a woman
- мы купили = we bought
The infinitive is купить = to buy.
Why use купил and not покупал?