Barnet har mye energi.

Barnet is the definite singular form, meaning the child.

• et barn = a child
• barnet = the child

The noun barn is a neuter noun, so the definite ending is -et.

A useful pattern is:

• et hus → huset
• et barn → barnet

So in this sentence, barnet specifically means the child.

Barn is a neuter noun in Norwegian.

That matters because neuter nouns usually take:

• et in the indefinite singular: et barn
• -et in the definite singular: barnet

So the form barnet tells you both:

1. it is singular
2. it is definite (the child)

Har is the present tense of å ha, which means to have.

So:

• å ha = to have
• har = have / has

In Norwegian, the same present-tense form is used with all subjects:

• jeg har = I have
• du har = you have
• barnet har = the child has

So Barnet har mye energi literally follows the same basic idea as English: The child has a lot of energy.

Because energi is treated as an uncountable noun here, like energy in English.

Use:

• mye with uncountable nouns
• mange with countable plural nouns

Examples:

• mye energi = a lot of energy
• mye vann = a lot of water
• mange bøker = many books
• mange barn = many children

So mye energi is correct because you do not normally count energy as separate items.

Because energi is being used as a mass/uncountable noun, and after mye you normally do not use an article.

So:

• mye energi = a lot of energy
• not mye en energi

This is similar to English, where you say a lot of energy, not a lot of an energy.

Yes. Barn is one of those Norwegian nouns whose indefinite singular and indefinite plural look the same.

Forms:

• et barn = a child
• barnet = the child
• barn = children
• barna or barnene = the children
  
  • barna is very common in everyday language

So context is important. In your sentence, barnet clearly means the child, not children.

Yes. That would mean A child has a lot of energy.

Compare:

• Barnet har mye energi = The child has a lot of energy
• Et barn har mye energi = A child has a lot of energy

So the difference is just definite versus indefinite:

• barnet = a specific child already known from context
• et barn = any child / a child

Yes, but it is not exactly the same.

• Barnet har mye energi = The child has a lot of energy
• Barnet er energisk = The child is energetic

The first focuses on having a lot of energy, possibly in a particular moment or general sense.

The second uses an adjective and sounds more like a description of the child’s character or usual behavior.

Both are natural, but they are slightly different in nuance.

This is the normal Norwegian main-clause word order:

Subject + verb + object/complement

• Barnet = subject
• har = verb
• mye energi = object/quantity phrase

So the sentence is very straightforward.

Norwegian also follows the V2 rule in main clauses, which means the verb usually comes in the second position. For example:

• I dag har barnet mye energi. = Today the child has a lot of energy.

Here I dag takes the first position, so har still stays in the second position.

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

• Har barnet mye energi? = Does the child have a lot of energy?

This is a common pattern in Norwegian:

• Barnet har mye energi.
• Har barnet mye energi?

So Norwegian often forms simple questions by switching the order of the subject and verb.

Mye can be tricky for English speakers.

A rough guide is something like MYE-uh, but very compressed, with the y being the Norwegian y sound, which does not exist exactly in English.

A few tips:

• The m is normal.
• The y is a rounded front vowel: say ee while rounding your lips.
• The final e is lightly pronounced.

So it is not like English my. It is more like my plus a small extra vowel, but with a Norwegian vowel quality.

Yes, energi is generally a common-gender noun: en energi.

But in this sentence you do not see the article because the noun is used in a mass/uncountable sense after mye:

• en energi = an energy or a kind of energy in a special context
• mye energi = a lot of energy

So the lack of en does not mean the noun has no gender; it just means the grammar of this phrase does not require an article.