Spínatið fer í súpuna, en baunirnar fara í salatið.

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

In this sentence:

• spínat = spinach

• spínatið = the spinach

• baunir = beans

• baunirnar = the beans

• súpa = soup

• súpuna = the soup

• salat = salad
• salatið = the salad

The exact form of the ending changes depending on:

• the noun’s gender
• whether it is singular or plural
• the noun’s case

So these endings are not random—they carry important grammatical information.

Because the verb has to agree with the subject in number.

• spínatið is singular, so the verb is fer = goes
• baunirnar is plural, so the verb is fara = go

So:

• Spínatið fer ... = the spinach goes ...
• Baunirnar fara ... = the beans go ...

This is very common in Icelandic: the verb changes depending on whether the subject is singular or plural.

Because í can take different cases depending on meaning.

With motion toward/into something, Icelandic uses the accusative:

• í súpuna = into the soup

With location in something, Icelandic uses the dative:

• í súpunni = in the soup

So the sentence uses í súpuna because the spinach is understood as going into the soup, not already being in it.

Yes. For the same reason as í súpuna, this is also accusative because it shows movement into something.

• í salatið = into the salad

If you were describing location instead, you would use the dative:

• í salatinu = in the salad

So:

• motion → accusative
• location → dative

Here it is best understood as into.

The preposition í can correspond to both English in and into, depending on the case:

• í + accusative → into
• í + dative → in

Since the sentence has í súpuna and í salatið (accusative forms), the meaning is into the soup and into the salad.

Not necessarily in a literal walking/traveling sense. In cooking or recipe-style language, fara is often used in a broader way, meaning something like:

• goes into
• is added to
• gets put into

So Spínatið fer í súpuna can be understood naturally as:

• The spinach goes into the soup
• or The spinach is added to the soup

It is a very normal way to talk about where ingredients belong.

That is just how these nouns are commonly used.

• spínat is usually treated like a mass noun, similar to English spinach. You normally do not count it as individual items.
• baunir means beans, which are naturally countable, so plural is very common.

So the contrast is not unusual:

• the spinach → singular mass noun
• the beans → plural count noun

The basic dictionary forms are:

• spínat = spinach
• súpa = soup
• baun = bean
• salat = salad

In the sentence, they appear in inflected forms:

• spínatið = definite singular of spínat
• baunirnar = definite plural of baun
• súpuna = accusative definite singular of súpa
• salatið = accusative definite singular of salat

A learner often needs to know both the dictionary form and the form used in the sentence.

Yes, gender matters a lot in Icelandic because it affects endings.

These nouns are:

• spínat — neuter
• súpa — feminine
• baun — feminine
• salat — neuter

That helps explain the different forms:

• neuter singular definite often has -ið

  • spínatið
  • salatið

• feminine plural definite here is -nar

  • baunirnar

• feminine accusative singular definite here is -na

  • súpuna

So yes, gender is one of the main reasons the endings differ.

Yes, this is a normal and straightforward Icelandic word order:

• subject + verb + prepositional phrase

So:

• Spínatið = subject
• fer = verb
• í súpuna = prepositional phrase

Then:

• en = but
• baunirnar = subject
• fara = verb
• í salatið = prepositional phrase

This is a very natural structure for simple statements.

Here, en means but and joins two contrasting statements:

• the spinach goes into the soup,
• but the beans go into the salad.

It often works very much like English but in this kind of sentence.

Yes, you could, but the meaning would change.

• Spínatið fer í súpuna = The spinach goes into the soup
• Spínat fer í súpu = Spinach goes into soup / Spinach goes into a soup

Without the definite endings, the nouns become more general or indefinite. In recipe instructions, both definite and indefinite wording can appear, depending on whether the speaker means:

• specific ingredients/dishes already known in context
• or ingredients in a more general sense

The letter ð in Icelandic is often like the th in English this, though its exact pronunciation can vary depending on position.

In these words:

• spínatið
• salatið

the ð is very soft. In careful pronunciation, it is usually like English voiced th. In fast speech, it may sound weaker.

Also, Icelandic stress is usually on the first syllable, so:

• SPÍ-na-tið
• SAL-a-tið
• SÚ-pu-na
• BAU-niR-nar

That first-syllable stress is a useful general rule in Icelandic.