Questions & Answers about Hemlaljósið virkar.
Because Icelandic usually puts the definite article on the end of the noun instead of using a separate word like the.
So:
- hemlaljós = brake light / a brake light
- hemlaljósið = the brake light
The ending -ið is the definite article here, and it also shows that the noun is neuter singular.
It is singular: the brake light.
A tricky thing is that the basic form hemlaljós can look the same in singular and plural, because ljós is one of those neuter nouns whose indefinite singular and indefinite plural are identical in form.
Useful forms:
- hemlaljós = a brake light / brake lights depending on context
- hemlaljósið = the brake light
- hemlaljósin = the brake lights
So in your sentence, the ending -ið makes it clearly singular and definite.