Learn Hardcore Icelandic: Skólinn er opinn.

The sentence translates as "The school is open." Here, Skólinn means "the school" (with the definite article attached as a suffix), er is the present form of the copular verb "is," and opinn is an adjective meaning "open."

Why does the noun Skólinn have a suffix attached to it, and how does it work?

In Icelandic, definiteness is expressed by adding a suffix to the noun rather than using a separate article like "the" in English. The base noun skóli (meaning "school") becomes Skólinn when the definite suffix -inn is attached, indicating a specific, identifiable school.

How does the adjective opinn agree with the noun Skólinn in this sentence?

Adjectives in Icelandic must agree with the nouns they modify in gender, number, and definiteness. Since Skólinn is masculine, singular, and definite, the adjective opinn is inflected to match these properties. If the noun were of a different gender or in a different form, the adjective form would change accordingly.

What is the overall sentence structure of Skólinn er opinn, and how does it compare to English?

The sentence follows a subject–copula–adjective pattern. Skólinn is the subject, er is the linking (copular) verb meaning "is," and opinn is the predicate adjective. This structure is similar to English, where we say "The school is open." However, it's important to note that Icelandic main clauses typically follow a verb-second (V2) rule, meaning the finite verb always appears as the second element in the sentence.

Does the word order in this sentence reflect any particular grammatical rule in Icelandic?

Yes, it reflects the V2 (verb-second) word order, which is a hallmark of Icelandic syntax. In Skólinn er opinn, the subject Skólinn comes first, the verb er occupies the second position, and the adjective opinn follows. This V2 structure is consistent in all declarative main clauses in Icelandic, even though the sentence appears similar to English in its basic subject–verb–predicate order.