Hún fær ekki að sleppa morgunmatnum, því hún verður fljótt þreytt í skólanum.

In this sentence, fá að + infinitive means to be allowed to or to get to do something.

So:

• hún fær að sleppa = she is allowed to skip
• hún fær ekki að sleppa = she is not allowed to skip

Even though fá often means get or receive, that is not the main idea here. This is a very common Icelandic permission pattern.

Also, fær is the 3rd person singular present form of fá.

That is the normal position for negation in a simple clause like this.

So Icelandic says:

• Hún fær ekki að sleppa...

rather than putting ekki before the verb.

A useful basic pattern is:

• subject + verb + ekki + rest

For an English speaker, it can feel a little different because English often uses do not or puts not in other positions, but in Icelandic this placement is very natural.

Here að is the infinitive marker, like English to in to skip.

So:

• að sleppa = to skip

In this sentence, it follows the construction fá að + infinitive:

• fær að sleppa = is allowed to skip

This að is not the same as English that. It is just marking the infinitive verb.

Here sleppa means to skip, leave out, or go without something.

So sleppa morgunmatnum means skip breakfast.

That said, sleppa can have other meanings in other contexts, such as:

• let go
• release
• avoid, in expressions like sleppa við

So it is a flexible verb, and the exact meaning depends on the construction around it.

Because sleppa normally takes a dative object when it means skip/omit/go without something.

The noun morgunmatur changes form depending on case:

• morgunmatur = nominative
• morgunmat = dative/accusative stem form
• morgunmatnum = dative singular definite

So:

• sleppa morgunmatnum is correct because sleppa governs the dative

This is something learners usually just have to memorize with the verb: sleppa + dative.

The ending -num includes both:

• the dative singular ending
• the definite article meaning the

So morgunmatnum means the breakfast.

In context, this sounds like a specific expected meal — basically her breakfast / the breakfast she is supposed to eat. Icelandic often uses the definite form when talking about a concrete, known situation like that.

So the sentence is not just about breakfast in the abstract; it is about the breakfast she should not skip.

Here því means because.

It introduces the reason:

• Hún fær ekki að sleppa morgunmatnum = the main statement
• því hún verður fljótt þreytt í skólanum = the reason why

So the full logic is:

• She is not allowed to skip breakfast, because she gets tired quickly at school.

This því is a very common way to connect a statement with its explanation.

Because the second clause needs its own subject too.

So Icelandic says:

• ..., því hún verður fljótt þreytt í skólanum.

Even though it is still the same person, the clause after því is a full clause, so hún is stated again.

English does the same in normal speech:

• ..., because she gets tired quickly at school.

So this repetition is completely natural.

Not in this sentence. Here verður means gets or becomes.

The verb is verða, which can sometimes have a future-like meaning in other contexts, but here it clearly means a change of state:

• verður þreytt = gets tired / becomes tired

So the idea is not simply she will be tired, but rather she ends up getting tired.

Because fljótt is being used as an adverb here: quickly.

A very common Icelandic pattern is that the neuter singular form of an adjective is used adverbially.

So:

• fljótur = quick, fast (masculine adjective form)
• fljótt = quickly / fast (adverbial use)

In this sentence, fljótt modifies verður þreytt:

• verður fljótt þreytt = gets tired quickly

Because þreytt is the correct feminine singular nominative predicate form here.

The adjective is based on þreyttur:

• masculine: þreyttur
• feminine: þreytt
• neuter: þreytt

After verbs like vera and verða, predicate adjectives agree with the subject.

Since hún is feminine singular, the correct form is:

• hún verður þreytt

An English speaker may expect a different-looking feminine ending, but for this adjective the feminine singular is simply þreytt.

Because Icelandic uses:

• accusative after í for motion into
• dative after í for location

So:

• í skólann = into/to the school
• í skólanum = in/at the school

Here she gets tired while she is at school, so location is meant, and that requires the dative:

• í skólanum

Yes, literally it is in the school, but in normal English the most natural translation is often at school.

Icelandic very often uses í skólanum where English would say:

• at school
• in school

So this is one of those places where a very literal word-for-word translation can sound less natural in English than the actual meaning.

The comma separates the main statement from the reason clause.

So the sentence is divided like this:

• Hún fær ekki að sleppa morgunmatnum,
• því hún verður fljótt þreytt í skólanum.

This is standard and helps show that the second part explains the first. In other words, the comma marks the pause between the rule and the reason for the rule.