Vi skal montere sengen etter innflyttingen.

Skal usually expresses a plan, intention, or something that is going to happen: we are going to / we will.

So:

• Vi skal montere sengen = We are going to assemble the bed
• Vi monterer sengen = We are assembling the bed or We assemble the bed

In this sentence, skal shows that the action will happen later, after the move-in.

Not exactly. In modern Norwegian, skal is very common and often corresponds to:

• will
• going to
• shall (in some contexts)

Here it most naturally means are going to or will.

For English speakers, it is usually better to think of skal as a future/planned-action word rather than the old-fashioned English shall.

Montere means to assemble, to put together, or to install, depending on context.

In this sentence, montere sengen means assemble the bed.

It is not exactly the same as bygge:

• montere = put together from parts, often something manufactured
• bygge = build, construct

So if you buy a flat-pack bed from a store, montere is the natural verb.

Sengen is the definite form of seng:

• en seng = a bed
• sengen = the bed

Norwegian often uses the definite form where English also uses the. Since the sentence refers to a specific bed, sengen is used.

This is one of the most important features of Norwegian nouns: definiteness is usually added as an ending.

In Norwegian, the definite article is often added to the end of the noun instead of being a separate word before it.

For example:

• en bil = a car
• bilen = the car

So:

• en seng = a bed
• sengen = the bed

This is completely normal in Norwegian. English speakers often need time to get used to the idea that the is built into the noun.

Etter means after.

So:

• etter innflyttingen = after the move-in
• etter middag = after dinner
• etterpå is related, but means afterwards / later

In this sentence, etter introduces the time expression telling us when the bed will be assembled.

Innflyttingen means the move-in or the moving-in.

It comes from the verb å flytte inn, which means to move in.

Related forms:

• å flytte inn = to move in
• innflytting = moving in / move-in
• innflyttingen = the move-in

So the sentence refers to a specific move-in event, which is why the definite form is used.

Both forms can exist, but they are slightly different:

• innflytting = move-in / moving in in a more general sense
• innflyttingen = the move-in, a specific one

Here, the speaker means a particular move-in event, so innflyttingen is natural.

English speakers can think of it as the difference between:

• after moving in / after move-in (more general)
• after the move-in (specific event)

This is the normal Norwegian main-clause word order:

• Vi = subject
• skal = finite verb
• montere = infinitive
• sengen = object
• etter innflyttingen = time expression

So the structure is basically:

Subject + verb + infinitive + object + time phrase

This is very similar to English in this kind of sentence: We are going to assemble the bed after the move-in.

Yes. Norwegian is flexible, although some positions sound more neutral than others.

The most neutral version is:

• Vi skal montere sengen etter innflyttingen.

You could also say:

• Etter innflyttingen skal vi montere sengen.

That version emphasizes the time phrase a bit more: After the move-in, we will assemble the bed.

Notice that when a time phrase comes first in a main clause, the verb still stays in second position:

• Etter innflyttingen skal vi ...

This is an important Norwegian word-order rule.

Yes. It is a noun derived from the phrasal verb å flytte inn.

This is very common in Norwegian. Actions can often be turned into nouns:

• å flytte inn = to move in
• innflytting = move-in / moving in

Then the definite ending is added:

• innflyttingen = the move-in

English does this too sometimes, but Norwegian often uses these noun forms very naturally.

A rough guide for an English speaker is:

Vee skahl mon-TEH-reh SENG-en EF-ter INN-flyt-ning-en

A few notes:

• vi sounds like vee
• skal has a broad a, not like English scale
• sengen has stress on the first syllable: SENG-en
• etter has stress on the first syllable: EF-ter
• innflyttingen is longer, with the main stress near the beginning

Exact pronunciation depends somewhat on dialect, but this rough version will help.

Yes, possibly.

• montere sengen = more like assemble/install the bed
• sette sammen sengen = put the bed together

Both can work, especially for furniture. Montere can sound a little more formal or technical, while sette sammen is often more everyday and literal.

So a learner may hear both, depending on the speaker and situation.