Questions & Answers about Jag lägger nyckeln i lådan.
Because nyckeln is the definite form: the key.
In Swedish, definiteness is usually added as an ending on the noun:
- en nyckel = a key
- nyckeln = the key
So in this sentence, the speaker is talking about a specific key, not just any key.
For the same reason: lådan means the box / the drawer.
- en låda = a box / a drawer
- lådan = the box / the drawer
Swedish often uses the definite ending -n with common-gender nouns:
- nyckel → nyckeln
- låda → lådan
So the sentence refers to a specific box or drawer.