Antingen polisanmäler vi stölden eller så går vi till polisstationen.

It is the Swedish way to set up an either ... or ... choice.

• antingen = either
• eller = or
• så often helps introduce the second full clause

So the structure is:

Antingen + first option, eller så + second option.

This is very common when you are choosing between two actions.

This is because Swedish follows the V2 rule in main clauses: the finite verb usually comes in the second position.

In the first clause, Antingen is placed first, so the verb must come next:

• Antingen polisanmäler vi stölden

Not:

• Antingen vi polisanmäler stölden

The same thing happens in the second clause:

• eller så går vi till polisstationen

Here, så takes the first position inside the clause, so går comes second and vi comes after it.

In this kind of sentence, så is very common before the second alternative when that alternative is a full clause.

So:

• Antingen ... eller så går vi ...

sounds very natural.

The så does not really change the basic meaning much here. It mainly helps mark the second option clearly and makes the sentence flow better.

You will often see:

• antingen ... eller så ...

But with shorter alternatives, så may be left out:

• Antingen kaffe eller te

Polisanmäler is the present tense of polisanmäla, which means to report something to the police.

It is written as one word because Swedish very often forms compound words. Here it is built from:

• polis = police
• anmäla = report, notify

So polisanmäla literally means something like police-report.

This is completely normal in Swedish. English often writes things as separate words where Swedish prefers one compound word.

Yes. Both are possible.

• polisanmäla stölden = report the theft to the police
• anmäla stölden till polisen = report the theft to the police

The compound verb polisanmäla is just a very common and compact way to say it.

They are both definite singular nouns:

• en stöld → stölden = the theft
• en polisstation → polisstationen = the police station

In Swedish, the definite article is usually added to the end of the noun as a suffix.

So instead of a separate word like English the, Swedish often uses:

• -en
• -et

depending on the noun.

Here, the speaker means a specific theft and a specific police station, so the definite form is used.

Because till is the normal preposition for movement to a place.

• gå till polisstationen = go to the police station

If you said på polisstationen, that would mean at the police station, not movement toward it.

So:

• till = to, toward
• på = at, on
• i = in

That is very normal in Swedish.

Swedish often uses the present tense to talk about:

• future actions
• plans
• decisions
• what happens next

So polisanmäler and går are present-tense forms, but in context they can easily mean something like will report and will go.

English does this sometimes too, but Swedish does it even more naturally.

The dictionary forms are:

• polisanmäla → polisanmäler
• gå → går

So if you want to look them up, search for polisanmäla and gå.

A useful thing to notice is that går is irregular, so it does not look exactly like the infinitive gå.

It is an en word:

• en stöld
• stölden

That is why the definite form ends in -en.

The same is true for polisstation:

• en polisstation
• polisstationen