Líkaminn þarf svefn.

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

• líkami = body
• líkaminn = the body

The ending -inn is the definite article here. So Líkaminn means the body, not just body.

Líkami is a masculine noun, and yes, that matters a lot in Icelandic. Gender affects:

• the form of the definite article
• adjective endings
• pronouns
• sometimes case endings

In this sentence, the masculine singular nominative definite form is líkaminn.

Yes. Líkaminn is the subject of the sentence, so it is in the nominative case.

The basic structure is:

• Líkaminn = subject, nominative
• þarf = verb
• svefn = object

So this is a normal subject–verb–object sentence.

Þarf is the 3rd person singular present tense of the verb þurfa, which means to need.

So:

• ég þarf = I need
• þú þarft = you need
• hann / hún / það þarf = he / she / it needs

Since líkaminn is singular, the verb is also singular: þarf.

Because Icelandic verbs change form depending on the subject and tense.

The dictionary form is the infinitive:

• þurfa = to need

But in a full sentence, you normally use a finite form:

• líkaminn þarf = the body needs

So þurfa is the verb’s base form, while þarf is the form that matches this subject in the present tense.

Svefn is the object of the verb, and with þurfa, the object is normally in the accusative case.

So in this sentence, svefn is accusative.

A useful thing to know is that some Icelandic nouns look the same in nominative and accusative, and svefn is one of those in the singular. So even though it is accusative here, the form is still svefn.

In Icelandic, nouns often appear without an article when speaking generally or abstractly.

Here, svefn means sleep in a general sense, like a need or necessity, not a sleep or the sleep.

That is very natural in Icelandic. English does something similar with abstract nouns too:

• The body needs sleep
• not usually The body needs a sleep in this kind of general statement

Yes, but it changes the meaning slightly.

• Líkaminn þarf svefn = the body needs sleep
• Líkami þarf svefn = a body needs sleep or body needs sleep, which sounds more general or less natural out of context

In most ordinary contexts, líkaminn is the more natural choice if you mean the body in a general human sense.

A rough guide:

• þ in þarf is like th in thing
• f in þarf is pronounced as v in this position, so it sounds roughly like tharv
• svefn begins with sv-, and the fn cluster is pronounced clearly

Very rough English-style approximations:

• þarf ≈ tharv
• svefn ≈ svepn / svevn depending on how carefully you hear it

Also:

• í in Líkaminn is a long ee sound
• á, í, ú, ý, ó, é are separate vowel letters in Icelandic, not just decorated versions of plain vowels

The normal order here is:

• Líkaminn þarf svefn.
• subject + verb + object

That is the most straightforward and neutral order.

Icelandic can move elements around more than English, especially for emphasis, style, or in questions, but beginners should learn this sentence as a standard SVO pattern.

So this version is the best one to copy first.

Yes. Svefn is the normal noun for sleep.

Related useful words include:

• að sofa = to sleep
• sofna = to fall asleep
• svefninn = the sleep
• svefnleysi = insomnia / lack of sleep

So this sentence uses a very normal and useful word.

This sentence is a good example of three important Icelandic basics:

1. The definite article is attached to the noun

   • líkaminn = the body

2. The verb changes form to match the subject

   • þarf from þurfa

3. Objects can be in a case chosen by the verb

   • svefn is accusative after þurfa

So even though the sentence is short, it shows several core Icelandic patterns at once.