Danish Plurals
Danish has several ways to form plurals. The most common patterns are -er and -e, but some nouns change their vowel and others don't change at all.
Common patterns
Singular
Plural
Pattern
English
en bil
biler
-er
cars
en bog
bøger
Vowel change + -er
books
en dag
dage
-e
days
et barn
børn
Irregular
children
en ting
ting
Zero-plural
things
et hus
huse
-e
houses
Watch for vowel changes
Some common nouns change their vowel in the plural: bog → bøger, mand → mænd, barn → børn. These are irregular but very frequent, so you'll learn them quickly.