Vi kan bære opp flytteesken.

Because kan is a modal verb. In Norwegian, modal verbs such as kan, vil, skal, må, and bør are normally followed by the bare infinitive without å.

So you get:

• Vi kan bære opp flytteesken.
• not Vi kan å bære opp flytteesken.

This is similar to English can carry, not can to carry.

Kan usually means can, am/is/are able to, or sometimes know how to, depending on context.

In this sentence, it most naturally means:

• we can
• we are able to

So Vi kan bære opp flytteesken means that we are able to carry the moving box up or we can carry the moving box upstairs/up.

Because opp adds the idea of upward movement.

• bære = carry
• bære opp = carry up

Very often, Norwegian uses a verb + particle combination like this, similar to English phrasal verbs:

• ta med = take along
• gå inn = go in
• sette opp = put up / set up
• bære opp = carry up

Without opp, the sentence would just mean carry the moving box, without saying where.

Here opp means up. In context, it often suggests upstairs or up to a higher place.

So bære opp flytteesken could mean:

• carry the box up the stairs
• carry the box upstairs
• carry the box up

The exact English translation depends on the situation, but the core idea is upward movement.

Yes, that is also possible.

Both of these can work:

• Vi kan bære opp flytteesken
• Vi kan bære flytteesken opp

In many cases, Norwegian allows the object to come either before or after the particle. The difference is usually small, though one version may sound more natural in a given context.

A useful tendency:

• with a pronoun object, the pronoun usually comes before the particle
  
  • Vi kan bære den opp.
• with a full noun, both orders are often possible
  
  • Vi kan bære opp flytteesken.
  • Vi kan bære flytteesken opp.

Flytteesken is a compound noun plus a definite ending.

It breaks down like this:

• flytte- = moving
• eske = box
• flytteeske = moving box
• flytteesken = the moving box

So Norwegian often builds nouns by combining words into one compound:

• flytteeske = moving box
• pappeske = cardboard box
• skoeske = shoebox

This is very common in Norwegian.

The ending -en marks the definite singular for many masculine nouns.

Here the base noun is:

• en eske = a box

When it becomes definite, it becomes:

• esken = the box

And in the compound:

• en flytteeske = a moving box
• flytteesken = the moving box

So instead of using a separate word for the, Norwegian often adds the definite ending directly to the noun.

It can vary somewhat depending on dialect and style, but in Bokmål it is commonly treated as a feminine noun:

• ei eske
• eska

However, Bokmål often allows many feminine nouns to be used as masculine too:

• en eske
• esken

In your sentence, flytteesken uses the masculine-style definite form -en, which is completely normal in Bokmål.

So a learner should recognize that Norwegian sometimes allows both masculine and feminine patterns for the same noun.

Vi is the subject, meaning we. Norwegian main clauses usually follow V2 word order, which means the finite verb comes in the second position.

In a simple statement like this, the normal order is:

• Vi = subject
• kan = finite verb
• bære opp flytteesken = rest of the clause

So:

• Vi kan bære opp flytteesken.

This is the ordinary word order for a statement.

The finite verb kan is in the present tense form, but with modal verbs that does not always translate as a simple present in English.

So Vi kan bære opp flytteesken can mean things like:

• We can carry the moving box up
• We are able to carry the moving box up

It is not a past tense sentence. If you wanted past meaning, you would usually use kunne:

• Vi kunne bære opp flytteesken. = We could / were able to carry the moving box up.

Yes. Flytteesken is singular definite, so it means the moving box — one specific box.

Compare:

• en flytteeske = a moving box
• flytteesken = the moving box
• flytteesker = moving boxes
• flytteeskene = the moving boxes

So this sentence refers to one specific moving box, not boxes in general.

Yes, it is natural. It sounds like a normal everyday sentence, especially in a practical situation such as moving furniture or boxes.

Depending on context, a speaker might also say:

• Vi kan bære opp esken. = We can carry the box up.
• Vi kan ta flytteesken opp.
• Vi kan bære flytteesken opp.

But your sentence is perfectly normal and understandable.

Then Norwegian usually places the pronoun before the particle:

• Vi kan bære den opp.

This is a very useful pattern to remember:

• full noun: bære opp flytteesken / bære flytteesken opp
• pronoun: bære den opp

So if you replace flytteesken with den, the most natural order is den opp, not opp den.