Hvis jakken ikke passer, må jeg få ordnet en retur i morgen.

Hvis means if. It introduces a condition:

• Hvis jakken ikke passer = If the jacket doesn’t fit

This whole part is a subordinate clause, setting up the condition for what happens next.

In Norwegian subordinate clauses, ikke usually comes before the verb.

So:

• Hvis jakken ikke passer
  literally: If the jacket not fits

This is different from a main clause, where ikke often comes after the verb:

• Jakken passer ikke = The jacket doesn’t fit

That difference in word order is very common in Norwegian and is something English speakers often need to get used to.

Here, passer comes from å passe, and it means fits.

So:

• Jakken passer = The jacket fits
• Jakken passer ikke = The jacket doesn’t fit

In other contexts, å passe can mean other things too, such as suit, match, or look after, so learners often wonder about it. In this sentence, it clearly means fit in the clothing sense.

This is because Norwegian main clauses follow the V2 rule: the verb must come in the second position.

The sentence begins with the subordinate clause:

• Hvis jakken ikke passer

After that, the main clause begins, and the finite verb must come first in that clause structure:

• må jeg få ordnet en retur i morgen

So the order becomes:

• Hvis ..., må jeg ...

If you started directly with the main clause, you would say:

• Jeg må få ordnet en retur i morgen

But when something else comes first, Norwegian usually inverts the subject and verb.

Må means must, have to, or need to.

In this sentence:

• må jeg få ordnet en retur = I need to get a return arranged

It expresses necessity or obligation.

Also, må is the present tense of å måtte, and modal verbs like må are followed by an infinitive without å:

• må få
• not må å få

Få ordnet is a very common Norwegian structure.

• få = get
• ordnet = past participle of å ordne = arrange, sort out, take care of

Together, få ordnet means something like:

• get arranged
• get sorted out
• have taken care of

So:

• må jeg få ordnet en retur
  means I need to get a return arranged or I need to sort out a return

This structure often suggests making sure something gets done, not necessarily doing every part of it personally.

Because after få in this kind of construction, Norwegian often uses a past participle.

Compare:

• Jeg må ordne en retur = I need to arrange a return
• Jeg må få ordnet en retur = I need to get a return arranged / get it sorted out

The version with ordnet gives a sense of the task being completed or taken care of.

En retur means a return, as in returning an item to a shop.

In shopping and customer-service contexts, this is understandable and natural enough. Depending on the context, Norwegian speakers might also say things like:

• ordne en retur
• sende den i retur
• returnere den

So en retur is fine here, especially in an online shopping context.

Because jakken is the definite singular form of jakke.

• en jakke = a jacket
• jakken = the jacket

Norwegian usually adds the definite article as an ending on the noun, instead of using a separate word like English the.

I morgen means tomorrow.

Literally, it looks like in morning, but as a fixed expression it means tomorrow.

There is no separate word for the because Norwegian uses this time expression idiomatically:

• i morgen = tomorrow
• i dag = today
• i går = yesterday

So you should learn i morgen as a set phrase.

Yes. Norwegian is fairly flexible with time expressions.

This sentence has:

• må jeg få ordnet en retur i morgen

But you could also say:

• Hvis jakken ikke passer, må jeg i morgen få ordnet en retur
• I morgen må jeg få ordnet en retur hvis jakken ikke passer
  though that changes the emphasis a bit

The original version sounds very natural. Putting i morgen at the end is a common, neutral choice.

Because the sentence begins with a subordinate clause:

• Hvis jakken ikke passer

and then continues with the main clause:

• må jeg få ordnet en retur i morgen

In Norwegian, it is standard to put a comma between an introductory subordinate clause and the main clause:

• Hvis ..., må jeg ...

So the comma helps separate the condition from the main statement.