Hun endrer tonen.

Because hun is the subject form of she.

• Hun = she
• Henne = her (object form)

In Hun endrer tonen, hun is the one doing the action, so Norwegian uses the subject form.

Examples:

• Hun snakker. = She speaks.
• Jeg ser henne. = I see her.

The base form is endre, which means to change.

In this sentence, endrer is the present tense:

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

So:

• Hun endrer tonen. = She changes the tone / She is changing the tone

No. In Norwegian, verbs do not change for person in the present tense.

So you get:

• Jeg endrer
• Du endrer
• Hun endrer
• Vi endrer

The verb stays endrer no matter who the subject is.

That is simpler than English, where you have I change but she changes.

Because tonen is the definite form of the noun.

• en tone = a tone
• tonen = the tone

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

So:

• tone by itself is not the normal full noun phrase here
• tonen means the tone

This is a very common pattern:

• en bil → bilen
• en bok → boka / boken depending on form
• en tone → tonen

Because Norwegian usually marks definiteness by adding an ending to the noun.

Compare:

• English: the tone
• Norwegian: tonen

This is one of the first big differences English speakers notice. Instead of putting the before the noun, Norwegian often adds:

• -en
• -et
• -a

depending on the noun.

It can mean both, depending on context.

Tone can refer to:

• a literal tone/sound
• a tone of voice
• the tone or mood of speech or writing

So Hun endrer tonen could mean:

• she changes her tone of voice
• she changes the tone of the conversation
• she changes the tone in a more abstract sense

Context tells you which meaning is intended.

Because Norwegian often uses the definite form where English would prefer a possessive like her, his, or their.

So Norwegian may say:

• Hun endrer tonen where English might naturally say:
• She changes her tone

In Norwegian, the definite noun often makes it clear enough whose tone is meant from the context.

If needed, Norwegian can be more explicit:

• Hun endrer tonen sin. = She changes her tone.

But in many situations, Hun endrer tonen sounds completely natural.

This is the normal word order for a simple statement:

• Hun = subject
• endrer = verb
• tonen = object

So the pattern is:

Subject + Verb + Object

That gives:

• Hun endrer tonen.

This is the standard order in basic Norwegian main clauses.

Yes. In a yes/no question, the verb usually comes first.

Statement:

• Hun endrer tonen. = She changes the tone.

Question:

• Endrer hun tonen? = Is she changing the tone? / Does she change the tone?

So Norwegian often forms questions by switching the order to:

Verb + Subject + Object

A careful approximate pronunciation is:

• Hun ≈ hoon but with a more rounded Norwegian vowel
• endrer ≈ EN-drer
• tonen ≈ TOO-nen

A rough full approximation:

• hoon EN-drer TOO-nen

A few notes:

• The r sound varies by dialect.
• The vowel in hun is not exactly like the English oo sound, but that approximation helps beginners.
• Norwegian rhythm is usually quite even and clear.

Yes, often you can, because both can mean change.

• Hun endrer tonen.
• Hun forandrer tonen.

Both are understandable and natural in many contexts. However:

• endre is often the more basic, everyday choice
• forandre can sometimes sound a bit stronger or more formal, depending on context

For a learner, endre is a very useful default verb to know.

A useful mini-paradigm is:

• å endre = to change
• endrer = changes / is changing
• endret = changed
• har endret = has changed / have changed

Examples:

• Hun endrer tonen. = She changes the tone.
• Hun endret tonen. = She changed the tone.
• Hun har endret tonen. = She has changed the tone.

This is a very useful verb pattern to learn early.