Kennarinn leiðréttir villuna strax.

Because Icelandic usually adds the definite article to the end of the noun instead of using a separate word like the.

• kennari = teacher
• kennarinn = the teacher

The ending -inn here is the masculine singular nominative definite ending.

For two reasons:

1. The noun is definite: the mistake/error
2. It is in the accusative case, because it is the direct object of the verb leiðrétta (to correct)

So:

• villa = mistake/error
• villuna = the mistake/error in the accusative singular

This is a very common Icelandic pattern: the noun ending changes for both case and definiteness.

Kennarinn is in the nominative case because it is the subject of the sentence — the person doing the action.

In this sentence, the teacher is the one correcting something, so the subject stays in the nominative.

Villuna is in the accusative case because it is the direct object of leiðréttir.

A useful way to think about it:

• Who is doing the action? → kennarinn
• What is being corrected? → villuna

Many Icelandic verbs take a direct object in the accusative, and leiðrétta is one of them.

The basic form is leiðrétta, which means to correct.

Leiðréttir is the present tense, used here for third person singular:

• ég leiðrétti = I correct
• þú leiðréttir = you correct
• hann/hún/það leiðréttir = he/she/it corrects

Since kennarinn is singular, leiðréttir is the correct form.

Because Icelandic verbs change depending on the person and number.

Here the subject is kennarinn (the teacher), which is third person singular, so the verb appears as leiðréttir.

English only changes a little in the present tense, usually just adding -s:

• the teacher corrects

Icelandic also changes the verb, but in its own way.

Strax is an adverb meaning immediately / right away, and putting it at the end is very natural in Icelandic.

So this word order is completely normal:

• Kennarinn leiðréttir villuna strax.

Adverbs are somewhat flexible in Icelandic, but not every position sounds equally natural in every sentence. The final position here is simple and idiomatic.

Yes, sometimes, but the most natural basic version here is the one you have.

For example, you may also hear:

• Kennarinn leiðréttir strax villuna.

That still makes sense, but the original sentence sounds very straightforward and neutral.

As a beginner, it is safest to learn the pattern:

subject + verb + object + adverb

Very often, yes. Icelandic commonly uses a suffixed definite article, meaning the article is attached to the end of the noun.

Examples from this sentence:

• kennarinn = the teacher
• villuna = the mistake

But the exact ending changes depending on:

• gender
• number
• case

So there is not just one fixed ending for the.

Yes, it matters a lot in Icelandic.

• kennari is masculine
• villa is feminine

Gender affects:

• the definite ending
• adjective forms
• pronouns
• some case endings

That is why kennarinn and villuna take different endings.

In this sentence, yes, it is quite similar:

• Kennarinn = subject
• leiðréttir = verb
• villuna = object
• strax = adverb

So the structure is basically:

Subject + Verb + Object + Adverb

That makes this a nice beginner-friendly sentence, even though the noun endings are more complex than in English.

A few helpful points:

• ei is pronounced roughly like ay in day
• ð in Icelandic is like the th in this, though in some positions it is softer or less fully pronounced
• ré has a clear r plus an yeh-like vowel quality
• the stress in Icelandic usually falls on the first syllable

So the word is stressed at the beginning: LEIÐ-rétt-ir

You do not need to pronounce it exactly like English sounds; the most important thing is to get used to Icelandic sound patterns over time.

Yes. Icelandic present tense can work like English present tense in more than one way.

Depending on context, Kennarinn leiðréttir villuna strax could mean something like:

• The teacher corrects the mistake immediately
• The teacher is correcting the mistake right away
• The teacher usually corrects the mistake immediately

In real life, context tells you which meaning is intended.