Vi flytter haugen.

Because haugen is the definite singular form of haug.

• haug = a pile / a heap / a hillock
• haugen = the pile / the heap

In Norwegian, the definite article is often added as an ending to the noun instead of being a separate word.

For many masculine nouns:

• indefinite singular: en haug
• definite singular: haugen

So Vi flytter haugen means we are moving the pile / the heap, not just a pile.

Flytter is the present tense of å flytte.

• å flytte = to move
• flytter = move / are moving / is moving, depending on the subject

Examples:

• Jeg flytter = I move / I am moving
• Vi flytter = we move / we are moving
• De flytter = they move / they are moving

Norwegian present tense is usually simpler than English, because the same verb form is used for all persons.

It can mean both, depending on context.

Norwegian present tense often covers both:

• simple present: we move
• present progressive: we are moving

So Vi flytter haugen could mean:

• We move the pile
• We are moving the pile

Context tells you which one sounds more natural in English.

Because Norwegian does not usually need a separate verb like English be to form the progressive.

English often says:

• We are moving the pile

Norwegian usually just uses the present tense:

• Vi flytter haugen

So Norwegian often expresses something more directly, without an extra helper verb.

Yes, vi is the normal subject pronoun for we.

Examples:

• Vi kommer = We are coming
• Vi bor her = We live here
• Vi flytter haugen = We are moving the pile

It is used the same way as English we when it is the subject of the sentence.

Haug is a noun, and it is usually masculine in Bokmål:

• en haug
• haugen

That is why the definite form becomes -en.

A common pattern for masculine nouns is:

• en bil → bilen
• en stol → stolen
• en haug → haugen

That would mean something different or sound unusual depending on context.

• Vi flytter haugen = We move the pile
  The pile itself is the thing being moved.

• flytte på noe often means move something a bit / reposition something / tamper with something

So:

• Vi flytter på haugen would suggest adjusting or shifting the pile, not simply stating that the pile is the direct object being moved in a straightforward way.

For a learner, the basic sentence to remember is:

• flytte noe = move something

The word order is the standard Norwegian main-clause order:

Subject + Verb + Object

• Vi = subject
• flytter = verb
• haugen = object

So:

• Vi flytter haugen

This is very similar to normal English word order:

• We move the pile

The past tense of å flytte is flyttet.

So:

• Vi flyttet haugen = We moved the pile

Useful forms:

• infinitive: å flytte
• present: flytter
• past: flyttet
• past participle: flyttet

A rough guide is:

• flytter sounds approximately like FLIT-er, but with a Norwegian y sound that does not exist naturally in English.

A few pronunciation notes:

• y in Norwegian is a rounded front vowel; English speakers often need practice for it.
• tt usually gives a clear, short consonant sound.
• the r at the end is light, depending on dialect.

If you cannot produce the exact y yet, that is very common for beginners.

A rough guide is:

• haugen sounds something like HOW-gen, though the exact vowel quality depends on dialect.

Notes:

• au often sounds somewhat like the vowel in English how
• g is pronounced here
• -en is the definite ending meaning the

So the whole word is clearly different from the base noun:

• haug
• haugen

Yes. Depending on context, haug can mean things like:

• pile
• heap
• mound
• sometimes a small hillock

In everyday speech, it can also appear in expressions where it means a lot:

• en haug med bøker = a pile of books / lots of books

So the exact English translation depends on what kind of haug is meant in context.

Only if it means the pile.

Compare:

• Vi flytter en haug = We are moving a pile
• Vi flytter haugen = We are moving the pile

So the choice between en haug and haugen depends on whether the noun is indefinite or definite, just like a vs the in English.