Questions & Answers about В магазине мы купили кокос и два манго.
В магазине means in the shop/store and uses the prepositional case.
After в, Russian can use different cases depending on meaning:
- в магазине = in the store (location, no movement) → prepositional
- в магазин = into the store (motion toward) → accusative
So here it is в магазине because the sentence tells us where the buying happened, not where someone went.
Купили is the past tense plural form of купить.
Why plural? Because the subject is мы = we.
In the past tense, Russian verbs agree with the subject in gender/number:
- я купил = I bought (male speaker)
- я купила = I bought (female speaker)
- мы купили = we bought
- он купил = he bought
- она купила = she bought
- они купили = they bought
So мы купили is the normal way to say we bought.