Parkeringshuset ligger bag stationen, så min søster går derhen først.

Because Danish usually writes compound nouns as a single word.

Here, Parkeringshuset is built from:

• parkering = parking
• hus = house/building
• -et = the definite ending for a neuter noun

So the indefinite form is et parkeringshus and the definite form is parkeringshuset.

The -s- in parkeringshus is a common linking sound in Danish compounds. English often uses separate words, but Danish usually does not.

Because Danish nouns have two grammatical genders:

• common gender: takes -en in the definite singular
• neuter: takes -et in the definite singular

So:

• en station → stationen
• et hus → huset

And since parkeringshus ends in hus, the whole compound has the same gender as hus, which is neuter:

• et parkeringshus → parkeringshuset

In Danish, ligge is very commonly used for physical location, especially with places, buildings, and areas.

So Parkeringshuset ligger bag stationen is the natural way to say that the parking garage is located behind the station.

Using er would sound less natural here, because er is more about identity or a general statement of being, while ligger is the normal verb for where something is situated.

Bag means behind.

Danish does not have the kind of case changes after prepositions that you see in languages like German. So after bag, you simply use the noun phrase:

• bag stationen = behind the station

So this part is grammatically much simpler than it might be in some other European languages.

Here så means so or therefore.

It connects the first clause and the second clause:

• the parking garage is behind the station
• so my sister goes there first

This is a coordinating conjunction joining two main clauses.

Be aware that så can also mean things like then or in that case in other contexts, so the exact meaning depends on how it is used in the sentence.

Because in this sentence så is a conjunction, not a sentence adverb taking first position inside the clause.

That means the second clause keeps normal main-clause order:

• min søster går derhen først

When så simply links two clauses, it does not count as the first element inside the second clause. So the subject min søster comes before the verb går.

Compare:

• Parkeringshuset ligger bag stationen, så min søster går derhen først.
• Så går min søster derhen først.

In the second example, så is now in first position inside the clause, so Danish uses verb-second order and puts går before min søster.

Derhen is directional. It means something like to there or over there.

That is why it works well with a movement verb like går:

• går derhen = goes/walks there

By contrast:

• der usually refers more to location: there
• derhen refers more to direction: to there

English often uses the same word there for both ideas, but Danish can make the distinction more clearly.

Literally, går means walks.

But in everyday Danish, it can sometimes be used in places where English would naturally say goes, especially if going on foot is understood or if the exact method of travel is not important.

Still, the most literal reading is that the sister goes there by walking.

If you wanted to specify another way of moving, Danish would usually use a different verb, for example:

• kører = drives/goes by vehicle
• cykler = bikes
• løber = runs

Min søster is the normal neutral way to say my sister.

Danish possessives usually work much like English ones:

• min søster = my sister
• min bil = my car

You may also see forms like søsteren min, but that often sounds more marked, emphatic, or stylistically different depending on context and dialect. For a basic learner sentence, min søster is the standard form to learn first.

Here først means first in the sense of sequence.

So it tells you that your sister goes there before doing something else, or before someone else does.

It does not mean for the first time here. It is about order.

Because that is a very natural place for this kind of adverb in Danish.

The clause structure is:

• min søster = subject
• går = verb
• derhen = directional adverb
• først = sequencing adverb

Danish often places adverbials like først fairly late in the clause, especially after the destination or object. So går derhen først sounds normal and idiomatic.

You can move elements around for emphasis, but this version is the most straightforward one for learners.