Hun arbeider for byrået.

Because hun is the subject form of she. In this sentence, she is the one doing the action.

• hun = she
• henne = her

So:

• Hun arbeider for byrået. = She works for the agency.
• Jeg kjenner henne. = I know her.

Arbeider means works. It comes from the verb å arbeide = to work.

It is very close in meaning to jobber from å jobbe. In many everyday situations, both are possible:

• Hun arbeider for byrået.
• Hun jobber for byrået.

The difference is mostly style:

• arbeider can sound a bit more formal or written
• jobber is very common in everyday speech

So a learner should understand arbeider as a normal present-tense verb meaning works.

Because it is in the present tense.

For many Norwegian verbs, the present tense is made with -er:

• å arbeide → arbeider
• å snakke → snakker
• å lære → lærer

So:

• å arbeide = to work
• arbeider = work / works

Norwegian does not add a special ending for he/she/it the way English does with works. The same verb form is used with all subjects:

• Jeg arbeider
• Du arbeider
• Hun arbeider
• Vi arbeider

Here, for means for in the sense of being employed by or working on behalf of someone or something.

So arbeider for byrået means:

• she works for the agency
• she is employed by the agency, or does work on its behalf

This is very similar to English.

Because byrået is the definite form: the agency.

Norwegian often adds the definite article to the end of the noun instead of putting a separate word in front.

For the noun et byrå:

• et byrå = an agency
• byrået = the agency

So:

• Hun arbeider for et byrå. = She works for an agency.
• Hun arbeider for byrået. = She works for the agency.

You can tell because its indefinite form is et byrå.

In Norwegian, nouns can be:

• en nouns
• et nouns
• and in many varieties, ei nouns

Since this word is et byrå, it is neuter.

That is why the definite singular form becomes byrået:

• et byrå → byrået

If it were a common-gender en noun, the definite ending would usually be -en instead.

Because in Norwegian, the definite article is usually attached to the noun as an ending.

Compare:

• English: the agency
• Norwegian: byrået

This is one of the most important differences between English and Norwegian nouns.

So instead of saying a separate word for the, Norwegian often uses:

• -en
• -et
• -a

depending on the noun.

Yes. The normal word order here is:

subject + verb + rest of sentence

So:

• Hun = subject
• arbeider = verb
• for byrået = prepositional phrase

This gives:

Hun arbeider for byrået.

Norwegian main clauses also follow the V2 rule, which means the finite verb is usually in the second position. For example:

• I dag arbeider hun for byrået. = Today she works for the agency.

Notice that when I dag comes first, arbeider still stays in second position, and hun moves after it.

Yes, but it means something slightly different.

• Hun arbeider for byrået = She works for the agency, meaning she is employed by it or works on its behalf.
• Hun arbeider på byrået = She works at the agency, focusing more on the workplace/location.

Sometimes both can be true, but they are not exactly the same.

A useful way to remember it:

• for = employer / organization served
• på = place

Yes. Arbeider can also mean worker as a noun.

So Norwegian has:

• en arbeider = a worker
• å arbeide → arbeider = works

In this sentence, it is clearly a verb, because it comes after the subject hun:

• Hun arbeider ... = She works ...

So context tells you which meaning it has.

You usually put ikke after the verb:

• Hun arbeider ikke for byrået. = She does not work for the agency.

That placement is very common in simple main clauses:

• Hun snakker ikke norsk.
• Vi kommer ikke i dag.

So for this sentence, the negative form is straightforward:

Hun arbeider ikke for byrået.

The stress is on the second syllable of byrå:

• by-RÅ
• by-RÅ-et

A rough English-friendly guide would be something like bih-ROH-eh or buh-ROH-et, but the exact vowel sounds are Norwegian sounds, so an English spelling can only be approximate.

The most important thing for a learner is:

• stress the rå part
• remember the definite ending -et is added at the end

So the written form byrået is basically byrå + et.