Omregistreringen koster mye.

The base form is omregistrering. That is the indefinite singular form: a re-registration / re-registration.

The sentence uses omregistreringen, which is the definite singular form: the re-registration.

In Norwegian, definiteness is usually shown by adding an ending to the noun instead of using a separate word like English the.

So:

• en omregistrering = a re-registration
• omregistreringen = the re-registration

The -en ending here marks the noun as definite singular.

It is usually treated as a feminine noun, but in Bokmål many feminine nouns can also be used as masculine.

So you may see:

• en omregistrering / omregistreringen
• sometimes also feminine-style forms such as ei omregistrering / omregistreringa

In standard written Bokmål, -en is very common, even for nouns that can be feminine.

Koster is the present tense form of å koste (to cost).

So:

• å koste = infinitive
• koster = present tense

Since the sentence states a general present fact, Norwegian uses the present tense: Omregistreringen koster mye.

Because mye is used for amounts, uncountable things, or as an adverb meaning a lot.

Here, koster mye means costs a lot, so mye is the correct choice.

Compare:

• mye penger = much/a lot of money
• mange biler = many cars

Since the idea is about the amount or degree of cost, not the number of separate things, mye is used.

In this sentence, mye is best understood as functioning adverbially. It modifies the verb koster and tells you to a great extent / by a large amount.

So koster mye is like saying:

• costs a lot
• is very expensive (not a word-for-word translation, but close in meaning)

This is the normal Norwegian subject–verb–adverb order for a main clause:

• Omregistreringen = subject
• koster = verb
• mye = adverbial/complement

So the structure is very similar to English: The re-registration costs a lot.

There is no inversion here because nothing has been moved to the front before the verb.

Yes, but it means something slightly different in form.

• Omregistreringen koster mye = The re-registration costs a lot
• Omregistreringen er dyr = The re-registration is expensive

These are close in meaning, but the first focuses on the amount of money it costs, while the second uses an adjective to describe it.

A rough pronunciation guide is:

ohm-reh-ghih-streh-RING-en

A few helpful points:

• The stress is mainly on -ring- in registrering.
• The r sound in Norwegian varies by region.
• The final -en is usually pronounced clearly, though not heavily.

You do not need a perfect accent at first; the important thing is to keep the word flowing as one unit: om-registrering-en.

No. Standard Norwegian normally requires an expressed subject in ordinary statements.

So you say:

• Omregistreringen koster mye.

You would not normally just say:

• Koster mye.

unless it is very informal, context-dependent speech. In normal grammar, the subject should be included.

Yes. Like many nouns ending in -ing, omregistrering can refer to the process/action of re-registering. In this sentence, because it is followed by koster mye, the meaning is naturally understood as the re-registration process/procedure costs a lot.

So the noun is not limited to a physical object; it can refer to the event, procedure, or administrative act itself.