Bókasafnskerfið virkar.

It is a compound noun:

• bókasafn = library
• kerfi = system
• bókasafnskerfi = library system
• bókasafnskerfið = the library system

So the whole sentence means The library system works or The library system is working/functions.

The ending -ið is the definite article attached to the noun. Icelandic usually puts the at the end of the noun instead of using a separate word like English does.

So:

• kerfi = system
• kerfið = the system

And in the full compound:

• bókasafnskerfi = library system
• bókasafnskerfið = the library system

This is very normal in Icelandic.

Because Icelandic normally uses a suffixed definite article. Instead of saying a separate word like English the, Icelandic adds it to the noun.

So English:

• the library system

Icelandic:

• bókasafnskerfið

There is a separate demonstrative/article-like word in Icelandic in some contexts, but in ordinary sentences like this, the ending on the noun is the usual way.

That s is part of how the compound is formed. Icelandic compounds often use a linking form, frequently based on a genitive form.

Here the idea is roughly:

• bókasafn = library
• linking form bókasafns-
• kerfi = system

So bókasafnskerfi is literally something like library’s system in structure, though in natural English we simply say library system.

This kind of linking consonant is very common in Icelandic compounds.

It is:

• singular
• neuter
• nominative
• definite

It is in the nominative because it is the subject of the sentence: the thing that virkar.

Virkar is from the verb virka.

In this sentence it means:

• works
• functions
• is functioning

So Bókasafnskerfið virkar means The library system works.

Depending on context, virka can also mean something like seem to work or have an effect, but here the straightforward meaning is functions/works.

It is present tense.

• að virka = to work / to function
• virkar = works / is working

So the sentence is a present-time statement: The library system works.

It agrees with a third-person singular subject.

The subject is Bókasafnskerfið = the library system, which is a singular thing, so the verb is singular too:

• ég virka = I work/function
• þú virkar = you work/function
• það virkar = it works/functions

Here bókasafnskerfið is grammatically treated like it, so virkar is the correct form.

No, this is the basic and very common Icelandic word order:

• Subject + Verb

So:

• Bókasafnskerfið = subject
• virkar = verb

This is the same basic order as English The library system works.

A helpful rough guide for English speakers is:

BOH-ka-sahvns-KEHr-vith

A few pronunciation notes:

• ó is a long vowel, roughly like oh
• stress is usually on the first syllable in Icelandic
• ð is like the th in this, not the one in thin
• hv is not present here, so nothing unusual there
• the cluster fnsk can feel heavy; try saying it slowly at first:
  • bóka-safns-kerfið

You do not need perfect pronunciation right away; just getting the stress on the first syllable and the ð approximately right is a good start.

Not always. It overlaps a lot with English work, but the exact usage depends on context.

For example, virka often means:

• function
• work
• be effective
• sometimes seem or come across as

In this sentence, the safest translation is works/functions.

So yes, work is correct here, but do not assume virka matches English work perfectly in every sentence.

Yes. Icelandic present tense often covers both simple present and what English might express as present progressive, depending on context.

So:

• The library system works
• The library system is working

Both can fit, though works/functions is usually the most neutral translation.

Not in standard Icelandic as a complete noun phrase meaning library system in this sentence.

You would normally need either:

• Bókasafnskerfið virkar = The library system works or
• Bókasafnskerfi virka... only in a context where library systems is plural or where the noun is being used differently

For a singular indefinite noun, you would usually say:

• Bókasafnskerfi virkar is not the normal singular indefinite equivalent

That is because kerfi is one of those neuter nouns whose singular and plural can be tricky for learners. In practice, if you want to say a library system works, you would usually need a fuller context or a different phrasing.

So for this sentence, Bókasafnskerfið is the clean, natural form.

Because Icelandic, like German and the other Nordic languages, very often makes compound nouns as a single word.

So English:

• library system

Icelandic:

• bókasafnskerfi

This is completely normal. When learning Icelandic vocabulary, it helps to get used to spotting the smaller parts inside a long compound word.

The dictionary form would usually be the indefinite singular nominative:

• bókasafnskerfi

If you are looking it up, that is the form you would want, not bókasafnskerfið.

Likewise for the verb:

• dictionary form: virka
• sentence form: virkar

Yes. It is short, simple, and completely natural.

It sounds like a straightforward statement such as:

• The library system works.
• The library system is functioning.

It could be said, for example, after testing software, a catalog, or an internal circulation system.