Barnet plukker bæret.

Because -et is the definite article suffix for many neuter nouns in Norwegian.

So:

• et barn = a child
• barnet = the child

and

• et bær = a berry
• bæret = the berry

Unlike English, Norwegian often puts the at the end of the noun instead of using a separate word.

In Norwegian, the usual way to say the child or the berry is to attach the definite ending directly to the noun:

• barnet
• bæret

Using a separate word like det is not the normal basic pattern here.

You may sometimes see det together with a noun in more advanced structures, but in a simple sentence like this, barnet and bæret are the correct forms.

Plukker is the present tense of the verb å plukke.

So:

• å plukke = to pick
• plukker = pick / picks / is picking, depending on context

In Norwegian, the present tense is often made by adding -er to the verb stem.

No. Norwegian verbs do not change for person the way English verbs do.

So you get:

• jeg plukker = I pick / am picking
• du plukker = you pick / are picking
• barnet plukker = the child picks / is picking

The verb form stays the same.

Yes. In this sentence, the order is:

• Barnet = subject
• plukker = verb
• bæret = object

So the pattern is:

Subject + Verb + Object

That is the normal order in a simple main clause.

However, Norwegian also follows the verb-second rule in main clauses. That means if you start with another element, the verb still comes second:

• I dag plukker barnet bæret. = Today, the child picks the berry.

It is singular definite: the berry.

This noun can be confusing because bær has the same form in singular indefinite and plural indefinite:

• et bær = a berry
• bæret = the berry
• bær = berries
• bærene = the berries

So in your sentence, bæret clearly means the berry, not berries.

It can be either, depending on the form around it.

• et barn = a child
• barn = children
• barnet = the child
• barna / barnene = the children

So barn is one of those nouns where the singular indefinite and plural indefinite forms look different only because singular has et in front of it.

In your sentence, barnet is definitely singular: the child.

The letter æ is pronounced somewhat like the a in English cat for many learners, though not exactly the same in every dialect.

So bær sounds roughly like bear said with a more open front vowel, but be careful: it is not exactly English bear.

A rough learner-friendly pronunciation guide:

• barnet ≈ BAR-neht
• plukker ≈ PLOOK-er
• bæret ≈ BEH-ret with æ

The exact sound varies by dialect, but recognizing æ as a separate vowel is important.

Because Norwegian usually expresses the by adding an ending to the noun.

So instead of:

• the child
• the berry

Norwegian says:

• barnet
• bæret

This is one of the biggest differences from English noun structure.

It can mean both, depending on context.

Norwegian present tense often covers both:

• Barnet plukker bæret.
  = The child picks the berry. or = The child is picking the berry.

If you want to make the ongoing action especially clear, Norwegian can also use other constructions, but the simple present often works on its own.