Questions & Answers about Den voksne hjælper barnet i haven.
Because voksen is normally an adjective meaning adult or grown-up, but Danish can also use adjectives as nouns.
So:
- en voksen = an adult
- den voksne = the adult
In this sentence, voksne is not describing another noun like person. It is standing on its own and means the adult.
After a definite article like den, adjectives usually take the -e ending.
Compare:
- en voksen = an adult
- den voksne = the adult
So the -e here does not mean plural. It is the normal definite form of the adjective.
Den is used with common gender words, while det is used with neuter words.
In den voksne, the expression is treated like a common-gender human noun, so Danish uses den.
Very roughly:
- den = common gender singular definite
- det = neuter singular definite