Veggvinkelen endrer seg.

It breaks down like this:

• vegg = wall
• vinkel = angle
• -en = the definite singular ending, equivalent to the

So veggvinkelen means the wall angle.

In Norwegian, the is often attached to the end of the noun instead of being a separate word.

For example:

• en vinkel = an angle
• vinkelen = the angle

With compounds, the definite ending goes on the whole compound:

• veggvinkel = wall angle
• veggvinkelen = the wall angle

Endrer is the present tense of å endre, which means to change.

So:

• å endre = to change
• endrer = changes / is changing

In simple sentences like this, Norwegian present tense can often correspond to either English changes or is changing, depending on context.

Seg is a reflexive pronoun. In this sentence, it is part of the expression endre seg, which means to change.

Literally, it can feel like change itself, but in natural English we usually just say change.

So:

• endre = change something
• endre seg = change

This is very common in Norwegian.

This is an important distinction:

• endre is usually transitive, so it takes an object:
  Jeg endrer planen = I change the plan

• endre seg is intransitive/reflexive, meaning the subject changes:
  Planen endrer seg = The plan changes

So in Veggvinkelen endrer seg, the wall angle is the thing that changes.

It can refer to both people and things.

In this sentence, seg refers back to veggvinkelen, which is a thing, not a person. That is completely normal in Norwegian.

Depending on context, seg can mean:

• himself
• herself
• itself
• themselves

But in many cases, English does not translate it directly.

This is normal statement word order in Norwegian:

• Veggvinkelen = subject
• endrer = finite verb
• seg = reflexive pronoun

So the structure is basically:

subject + verb + reflexive pronoun

That gives:

Veggvinkelen endrer seg.

In a yes/no question, the verb comes first:

Endrer veggvinkelen seg?

That means Is the wall angle changing? or Does the wall angle change?

So the statement and question are:

• Veggvinkelen endrer seg.
• Endrer veggvinkelen seg?

You would say:

Veggvinkelen endrer seg ikke.

In a main clause, ikke usually comes after the finite verb:

• endrer = verb
• ikke = not

So the pattern is:

subject + verb + ikke

with seg staying with the verb phrase:

Veggvinkelen endrer seg ikke.

Yes, but it does not mean exactly the same thing.

• Veggvinkelen endrer seg = The wall angle changes
• Veggvinkelen blir endret = The wall angle is being changed / gets changed

The first means the angle changes.
The second is passive and suggests that something or someone changes it.

So endrer seg is usually the more natural choice if you simply mean that it changes.