Hundurinn bítur skóinn.

In Icelandic, the definite article is usually attached to the end of the noun instead of being a separate word.

• hundurinn = the dog
• skóinn = the shoe

So the sentence does not need a separate word like English the.

Because Icelandic noun endings change for more than just definiteness. They also change for things like:

• gender
• case
• number
• the noun’s own declension pattern

Here:

• hundurinn is the nominative singular definite form of hundur
• skóinn is the accusative singular definite form of skór

So skór first changes to its accusative form skó, and then the definite article is added, giving skóinn.

This is very normal in Icelandic: the noun and the article work together as one inflected form.

You know from the case endings.

• hundurinn is nominative, so it is the subject: the one doing the action
• skóinn is accusative, so it is the direct object: the one receiving the action

So:

• Hundurinn = the dog is doing the biting
• skóinn = the shoe is being bitten

English relies more on word order for this. Icelandic often makes it clear through case.

Because bíta is the infinitive, meaning to bite.

In the sentence, you need the finite present-tense form that matches he/she/it:

• að bíta = to bite
• bítur = bites / is biting for he, she, it

Since hundurinn is singular and third person, bítur is the correct form.

The dictionary forms are:

• hundur = dog
• skór = shoe
• að bíta = to bite

What you see in the sentence are inflected forms built from those base forms.

The word order can change, but not completely freely.

Icelandic main clauses usually follow a verb-second pattern. That means the finite verb often stays in the second position.

For example, you can say:

• Hundurinn bítur skóinn.
• Skóinn bítur hundurinn.

In the second sentence, skóinn is moved to the front for emphasis or topic, but it still means The dog bites the shoe, because the case endings still show who is doing what.

If you said:

• Skórinn bítur hundinn

that would mean The shoe bites the dog, because now the cases are different.

So yes, word order can move around more than in English, but the endings matter a lot.

Usually Icelandic just leaves the noun without an article:

• Hundur bítur skó.

There is no ordinary article exactly like English a/an.

If you want to emphasize one, Icelandic can use einn, but that is not needed in a neutral sentence.

So in many cases:

• bare noun = a/an or just indefinite
• noun with attached article = the

Yes, it can often mean both, depending on context.

So Hundurinn bítur skóinn may mean:

• The dog bites the shoe
• The dog is biting the shoe

If Icelandic wants to be more explicitly progressive, it can use:

• Hundurinn er að bíta skóinn.

That means more specifically The dog is biting the shoe.

The accents in Icelandic are not just stress marks. They show a different vowel sound.

• í is a different vowel from i
• ó is a different vowel from o

Also, Icelandic words are usually stressed on the first syllable, not on the accented vowel just because it has an accent.

So the stress is roughly:

• HUN-dur-inn
• BÍ-tur
• SKÓ-inn

The accents help tell you how the vowel is pronounced.

Yes. Bíta is a strong verb, which means it changes its stem vowel in some forms instead of just adding regular endings.

Important forms include:

• að bíta = to bite
• bítur = bites
• beit = bit
• bitið = bitten

English does something similar with bite – bit – bitten, so this pattern is often familiar to English speakers even though the exact Icelandic forms are different.

Yes. The verb agrees with the subject in person and number.

Here the subject is:

• hundurinn = singular, third person

So the verb is:

• bítur = third-person singular present

If the subject were plural, the verb would change too:

• Hundarnir bíta skóinn. = The dogs bite / are biting the shoe.

So Icelandic verbs do change depending on the subject.