Questions & Answers about Matresterna står i kylskåpet.
Because Swedish very often makes compound nouns by joining words together.
Here, mat means food and rester means leftovers / remains. Together, matrester means food leftovers.
Then the ending -na is added to make it definite plural, so matresterna means the leftovers.
This is very normal in Swedish. English often uses separate words where Swedish prefers one combined word.
-na is the definite plural ending here.
So:
- en matrest = a leftover / a food remnant
- matrester = leftovers
- matresterna = the leftovers
In this sentence, the speaker is talking about specific leftovers, so Swedish uses the definite form matresterna.