Vi må bevare naturen.

Vi is the subject form of we.

• vi = we
• oss = us

In Vi må bevare naturen, vi is doing the action, so Norwegian uses the subject form.

Compare:

• Vi må bevare naturen = We must preserve nature
• Han hjelper oss = He helps us

Må is a modal verb meaning must, have to, or sometimes need to, depending on context.

In this sentence, it expresses necessity or obligation:

• Vi må bevare naturen = We must / have to preserve nature

A useful point: må is the present-tense form, but in English it often translates naturally as must or have to.

After a modal verb like må, Norwegian normally uses the bare infinitive—that means the infinitive without å.

So:

• må bevare = must preserve
• not må å bevare

This is similar to English, where you say:

• must preserve
• not must to preserve

Other common modal verbs that work the same way include:

• kan = can
• skal = shall / will / is going to
• vil = want to / will
• bør = should

Examples:

• Vi kan hjelpe = We can help
• Du bør vente = You should wait

Bevare is the infinitive form of the verb, meaning to preserve or to protect/keep in a preserved state.

Because it comes after må, it stays in the infinitive:

• å bevare = to preserve
• må bevare = must preserve

Other forms of the verb are:

• bevarer = present tense
• bevarte = past tense
• har bevart = has/have preserved

Example:

• Vi bevarer naturen = We preserve nature
• Vi må bevare naturen = We must preserve nature

Naturen is the definite form of natur, meaning the nature.

In Norwegian, the definite article is often attached to the end of the noun:

• natur = nature
• naturen = the nature

In this sentence, Norwegian prefers the definite form because it refers to nature in a general, shared sense—the natural world as something known and important.

This is very common in Norwegian, even where English might simply say nature without the.

That is a basic feature of Norwegian grammar. The definite article is usually a suffix attached to the noun.

For singular common-gender nouns:

• en bil = a car
• bilen = the car

For natur:

• en natur = a nature (less common in everyday use)
• naturen = the nature

So -en here is doing the job that the often does in English.

Norwegian can also use a separate definite word in some cases, especially with adjectives:

• den vakre naturen = the beautiful nature

Natur is usually a feminine noun, but in Bokmål many feminine nouns can also be treated as common gender with -en.

So you may see:

• naturen
• sometimes natura in dialects or more feminine-style usage, but naturen is the normal Bokmål form

For learners, naturen is the standard form to remember.

This sentence has the normal Norwegian main clause word order:

Subject + verb + infinitive/object

So:

• Vi = subject
• må = finite verb
• bevare = infinitive
• naturen = object

This is very similar to English:

• We must preserve nature

Nothing unusual is happening here.

Yes, but it means something a bit different.

• Vi må bevare naturen = We must preserve nature
  This stresses necessity or obligation.
• Vi skal bevare naturen = We will preserve nature or We shall preserve nature
  This often sounds more like a decision, plan, or promise.

So both are possible, but må is the better choice if you want the idea of must.

Yes. Bevare often means preserve, maintain, keep, or protect from being lost or damaged, depending on context.

Examples:

• bevare freden = preserve the peace
• bevare roen = keep calm / preserve calm
• bevare gamle bygninger = preserve old buildings

In Vi må bevare naturen, preserve is the most natural translation.

A rough pronunciation guide is:

• Vi ≈ vee
• må ≈ moh (with a rounded vowel)
• bevare ≈ beh-VAH-reh
• naturen ≈ nah-too-ren

A more approximate full pronunciation:

vee moh beh-VAH-reh nah-too-ren

A few notes:

• å in må is a distinct Norwegian vowel, not exactly like English o
• The stress in bevare is on the second syllable
• The r sound may vary depending on accent

It is neutral and completely natural in both speech and writing.

It works well in:

• everyday conversation
• school texts
• news
• environmental discussions
• formal writing

So it is a very useful model sentence for learners.