Hun antar det.

• Hun = she
• antar = assumes / supposes
• det = it / that / so, depending on context

Grammatically, this is a very standard subject + verb + object sentence:

• Hun = subject
• antar = verb
• det = object

Antar is the present tense of the verb anta.

Common forms are:

• å anta = to assume
• antar = assume / assumes
• antok = assumed
• har antatt = have/has assumed

A useful thing for English speakers: Norwegian verbs do not change according to the subject.

So you get:

• jeg antar = I assume
• du antar = you assume
• hun antar = she assumes
• vi antar = we assume

The verb stays antar for all of them.

Det is the thing being assumed. It often refers to:

• a previously mentioned idea
• a situation
• something abstract
• the English idea of it, that, or so

So Hun antar det can mean things like:

• She assumes it
• She assumes that
• She assumes so

Exactly which English translation fits best depends on context.

Norwegian has two common pronouns for it:

• den
• det

Very roughly:

• den is often used for common-gender nouns
• det is often used for neuter nouns and for ideas, situations, or whole statements

In Hun antar det, det is very natural because it often refers to an abstract idea rather than a specific physical object.

For example, if someone says:

• Kommer hun i morgen? = Is she coming tomorrow?

You could answer:

• Jeg antar det. = I assume so.

Here det means something like that / so.

Not exactly.

Both can relate to believing something, but they are not always interchangeable.

• tro = think / believe
• anta = assume / suppose

Anta often sounds a bit more like:

• making an assumption
• drawing a conclusion
• taking something as true without full certainty

Tro is often more general and common in everyday speech.

Compare:

• Jeg tror det. = I think so / I believe so.
• Jeg antar det. = I assume so / I suppose so.

So anta can sound slightly more formal or more deliberate than tro.

A careful approximate pronunciation is:

• Hun ≈ hoon with a rounded vowel that English does not have exactly
• antar ≈ AHN-tahr
• det ≈ often deh or day-like, depending on dialect and how clearly it is said

A simple learner-friendly approximation:

• hoon AHN-tahr deh

A few notes:

• The r in antar is usually clearly pronounced.
• In natural speech, det is often unstressed and can sound reduced.
• Pronunciation varies a lot by dialect in Norwegian.

Yes. Hun antar det is standard Bokmål.

In Nynorsk, you would more typically see:

• Ho antar det

So the main difference here is:

• hun = Bokmål
• ho = Nynorsk

To make it a question, Norwegian usually switches the verb and subject:

• Antar hun det? = Does she assume it? / Does she assume so?

To make it negative:

• Hun antar det ikke. = She does not assume it / She doesn’t assume so.

Notice something important: with short object pronouns like det, the pronoun often comes before ikke.

So:

• Hun antar det ikke. is the most natural neutral order.

Compare:

• Hun antar ikke det.

This can sound more contrastive, like:

• She doesn’t assume that (but maybe something else).

Usually, anta wants some kind of complement:

• an object: Hun antar det
• a clause: Hun antar at han kommer = She assumes that he is coming
• a noun phrase: Hun antar ansvaret = She assumes the responsibility

So Hun antar by itself can feel incomplete unless the context makes the missing part very obvious.

In most cases, you would say:

• Hun antar det or
• Hun antar at ...

Then you would normally use at to introduce the clause:

• Hun antar at han har rett.

Here:

• at = that
• han = he
• har rett = is right / is correct

So there is an important difference between:

• Hun antar det. = She assumes it / that / so
• Hun antar at han har rett. = She assumes that he is right

In other words:

• det replaces an idea
• at introduces a full clause

Yes. Anta can mean more than just assume, depending on context.

Common meanings include:

• assume
• suppose
• sometimes adopt, accept, or take on

Examples:

• Jeg antar det. = I assume so.
• Loven ble antatt. = The law was adopted/passed.
• Han antok navnet sitt. = He adopted his name.

In Hun antar det, the natural meaning is definitely She assumes it/so.