Learn Hardcore Icelandic: Bíllinn er þægilegur.

Bíllinn means "the car". It is formed by taking the noun bíll (car) and adding the definite article suffix -inn, which is how Icelandic marks a noun as definite—combining what English expresses with a separate word (the).

What role does er play in the sentence?

Er is the third-person singular present form of the verb vera (to be). It acts as the linking verb in the sentence, connecting the subject bíllinn ("the car") to the predicate adjective þægilegur ("comfortable").

Why does the adjective þægilegur not display any definite marker, even though the noun is definite?

In Icelandic, when an adjective is used predicatively (following a linking verb like er), it typically appears in its base form. Although adjectives generally agree with their nouns in gender, number, and case, in a predicate position they do not take on additional definite markers because the definiteness is already indicated in the noun itself.

How does the word order in Bíllinn er þægilegur compare to English sentence structure?

The structure of the sentence is quite similar to English. It follows a subject (bíllinn / "the car") – linking verb (er / "is") – predicate adjective (þægilegur / "comfortable") order. This straightforward pattern mirrors the typical declarative sentence structure in English.

Are there any other grammatical features in this sentence that differ from English?

Yes, there are a couple of points to note:

Definiteness as a suffix: Unlike English, which uses a separate word for the definite article (e.g., "the"), Icelandic attaches a suffix (like -inn) directly to the noun.
Adjective agreement: Although adjectives agree with their nouns according to gender, number, and case, in predicative positions (after the verb er) they remain in their basic form and do not show extra definite markers.
V2 word order: Icelandic typically follows the verb-second (V2) rule in main clauses, meaning the finite verb occupies the second position. In this sentence, after the subject bíllinn, the verb er appears in the second slot, consistent with that rule.