Questions & Answers about Vi køber ind i et supermarked i weekenden.
Køber on its own simply means “buy”.
Køber ind is a fixed verb + particle combination and means “to do the shopping / buy groceries / do the household shopping”. It’s more about the activity of going shopping, usually for everyday necessities, not just buying one specific item.
- Vi køber en bog. = We buy a book. (one item)
- Vi køber ind. = We do the shopping. (general activity, usually groceries)
You normally don’t drop ind if you mean “do the shopping”.
Ind here is a verb particle, not a literal “in/inside” like in English.
Historically it had more of a movement meaning (“buying in”), but in modern Danish købe ind is just treated as one verb that means “do the (grocery) shopping”.
- Vi køber i et supermarked sounds odd or incomplete.
- Vi køber ind i et supermarked is natural: We do our shopping in a supermarket.
So you should learn købe ind as a chunk, like an English phrasal verb.