Ég set blómin út á svalirnar.

A quick breakdown:

• Ég = the subject, I
• set = the finite verb, from setja (to put / place)
• blómin = the direct object, the flowers
• út = out / outside
• á svalirnar = a prepositional phrase showing destination, onto the balcony / out onto the balcony

So the structure is basically:

subject + verb + object + adverb + destination

Setja is the infinitive, meaning to put. In the sentence, you need a finite verb, not the infinitive, because the action is happening in the present.

The present-tense forms are:

• ég set
• þú setur
• hann/hún/það setur
• við setjum
• þið setjið
• þeir/þær/þau setja

So ég set means I put / I am putting.

Blómin is the definite plural form of blóm.

Here is the basic pattern:

• blóm = a flower / flowers
• blómið = the flower
• blómin = the flowers

In this sentence, blómin is also the direct object of setja, which takes the accusative. For this noun, the definite plural accusative looks the same as the nominative: blómin.

So the form tells you:

• it is definite: the
• it is plural: flowers
• it is the object of the verb

They do slightly different jobs.

• út gives the general idea of movement out / outside
• á svalirnar gives the specific destination: onto the balcony

So together they make the movement more complete and natural:

• not just put the flowers on the balcony
• but put the flowers out onto the balcony

This is very common in Icelandic: an adverb like út, inn, upp, or niður often appears together with a phrase naming the destination.

This is a very important Icelandic pattern:

• accusative after á usually shows movement toward a place
• dative after á usually shows location in a place

So:

• á svalirnar = onto the balcony / movement
• á svölunum = on the balcony / location

Because the sentence describes putting something there, the flowers are moving to the balcony, so á takes the accusative: svalirnar.

Because svalir is normally a plural noun in Icelandic. It is one of those words that are grammatically plural even when English uses a singular word.

So:

• svalir = balcony
• svalirnar = the balcony

Even though the form is plural, it often corresponds to singular balcony in English.

This is something you mostly just learn as a vocabulary fact:

• memorize svalir as the normal Icelandic word for balcony

That word order is natural in Icelandic.

A few things are happening:

1. Icelandic main clauses usually put the finite verb in the second position:

   • Ég set ...

2. After the verb, the object often comes before adverbs or particles:

   • set blómin út

So Ég set blómin út á svalirnar is a very normal order.

You may also hear other word orders in some contexts, but this version is straightforward and neutral.

Yes. That would still be a correct sentence.

The difference is nuance:

• Ég set blómin á svalirnar = I put the flowers onto the balcony
• Ég set blómin út á svalirnar = I put the flowers out onto the balcony

With út, the sentence emphasizes that the flowers are being moved outdoors. Without it, the sentence is still fine, but it says a little less.

In Icelandic, set here is present tense only.

• ég set = I put / I am putting
• ég setti = I put / I placed in the past

So unlike English, where set can be present or past depending on context, Icelandic clearly distinguishes them:

• set = present
• setti = past

It normally takes a direct object in the accusative.

In this sentence, the thing being put is blómin, so it appears in the accusative.

That is why it is useful to learn verbs together with the case patterns they use. For setja, a helpful pattern is:

• setja eitthvað = put something

Here:

• eitthvað would be accusative
• blómin is that accusative object

Probably this one:

Prepositions like á often switch case depending on movement vs. location.

In this sentence:

• á svalirnar = motion toward the balcony → accusative
• á svölunum = location on the balcony → dative

That distinction shows up constantly in Icelandic, so this sentence is a very useful model.