Har hun noensinne vært her?

Because this is a yes/no question in Norwegian. In main clauses, Norwegian usually has subject–verb order, but in yes/no questions the finite verb comes first.

• Statement: Hun har noensinne vært her is not natural, but the normal statement pattern would still place the verb after the subject.
• Question: Har hun noensinne vært her? = Has she ever been here?

So har comes first because Norwegian forms this kind of question by inverting the usual subject and verb order.

Noensinne means ever.

In this sentence, it asks whether something has happened at any time up to now:

• Har hun noensinne vært her?
• Has she ever been here?

It is a slightly stronger or more formal-sounding way to say ever. In everyday speech, many people would also use noen gang.

Both can mean ever.

• noensinne = ever, often a bit more formal, emphatic, or literary
• noen gang = ever, very common in everyday spoken Norwegian

So these are both possible:

• Har hun noensinne vært her?
• Har hun noen gang vært her?

They mean basically the same thing: Has she ever been here?

Because vært is the past participle of være (to be).

This sentence uses the present perfect, which is formed like this:

• har
  • past participle

So:

• har vært = has been

Examples:

• Hun har vært her. = She has been here.
• Har hun vært her? = Has she been here?

You use være only as the infinitive, like å være = to be.

Yes. It is the present perfect.

The structure is:

• har = present tense of å ha (to have)
• vært = past participle of å være (to be)

Together:

• har vært = has been

This tense is used to talk about life experience or something connected to the present, just like English has been.

So the sentence is asking about her experience up to now:

• Has she ever been here?

Because hun is the subject form of she.

In Har hun noensinne vært her?, hun is the person doing the action/state of being, so Norwegian uses the subject pronoun:

• hun = she
• henne = her

Compare:

• Hun har vært her. = She has been here.
• Jeg så henne her. = I saw her here.

So hun is correct because she is the subject of the sentence.

Her means here, and placing it at the end is very natural in Norwegian.

• Har hun noensinne vært her?

This is similar to English:

• Has she ever been here?

The word order sounds natural because her gives the location after the verb phrase har ... vært.

It may be understood, but it sounds less natural. The more natural order is:

• Har hun noensinne vært her?

In Norwegian, adverbs like noensinne often come before the past participle in this kind of sentence:

• har + noensinne + vært

So for learners, the safest and most natural version is:

• Har hun noensinne vært her?

Yes, usually that is the idea.

Vært her literally means been here, and in context it often implies:

• Has she ever visited this place?
• Has she ever come here before?
• Has she ever been present here?

So it can refer to her having been in this place at some time, whether as a visit, a stay, or simply being physically present.

That is wrong. The correct word is noensinne, written as one word.

• Correct: Har hun noensinne vært her?
• Incorrect: Har hun noe sinne vært her?

It is a fixed adverb meaning ever.

A very common everyday version would be:

• Har hun noen gang vært her?

This is a little more conversational than noensinne, but the meaning is almost the same.

So you can think of it like this:

• noensinne = slightly more formal or emphatic
• noen gang = very common everyday choice