Når skyerne forsvinder, kommer månen frem.

Når means when in the sense of a repeated event, a general truth, or something expected to happen.

So Når skyerne forsvinder, kommer månen frem is like saying:

• whenever the clouds disappear, the moon comes out
• when the clouds disappear, the moon appears

This is different from da, which is used for a specific event in the past:

• Da skyerne forsvandt, kom månen frem = when the clouds disappeared, the moon came out

So here når is used because the sentence describes a general situation, not one single past moment.

Skyerne is the definite plural form of sky.

• en sky = a cloud
• skyen = the cloud
• skyer = clouds
• skyerne = the clouds

Danish often adds the definite article to the end of the noun instead of using a separate word like English the.

So skyerne literally means the clouds.

Månen means the moon, while en måne would mean a moon.

In this sentence, we mean the specific moon that both speaker and listener know about, so Danish uses the definite form:

• en måne = a moon
• månen = the moon

Just like with skyerne, the definiteness is shown by adding an ending to the noun.

This is because Danish main clauses usually follow the V2 rule: the finite verb comes in second position.

The first part of the sentence is the subordinate clause:

• Når skyerne forsvinder

After that, the main clause begins. Since the subordinate clause comes first, it takes the first slot, so the verb in the main clause must come next:

• Når skyerne forsvinder, kommer månen frem

If you started with the main clause instead, you would say:

• Månen kommer frem, når skyerne forsvinder

Both are correct, but the word order changes because of the V2 rule.

In this sentence, frem is part of the expression komme frem, which often means:

• come forward
• come out
• appear
• emerge

With månen, it means something like come out or appear into view.

So månen kommer frem is a natural Danish way to express that the moon becomes visible.

Danish often uses the present tense for:

• general truths
• habitual actions
• events that are expected to happen

So even though English might sometimes use future wording like will come out, Danish can simply use the present:

• Når skyerne forsvinder, kommer månen frem

This is very normal. Danish does not need a separate future form here.

It is a subordinate clause because it is introduced by når, which is a subordinating conjunction.

A subordinate clause:

• depends on the main clause
• gives extra information about time, cause, condition, etc.

Here it tells us when the main action happens.

So the structure is:

• subordinate clause: Når skyerne forsvinder
• main clause: kommer månen frem

Yes. The comma separates the subordinate clause from the main clause:

• Når skyerne forsvinder, kommer månen frem.

In this sentence, the comma helps show where the first clause ends and where the main clause begins.

For learners, it is especially useful because it makes the word-order pattern easier to see.

Yes, absolutely.

That version is also correct:

• Månen kommer frem, når skyerne forsvinder.

The meaning is basically the same. The difference is mainly in emphasis and sentence structure:

• Når skyerne forsvinder, kommer månen frem puts the time condition first
• Månen kommer frem, når skyerne forsvinder starts with the main point

Notice that when the main clause comes first, the word order is the more straightforward subject + verb:

• Månen kommer frem

Here are the dictionary forms:

• når = when
• sky = cloud
• forsvinde = disappear
• måne = moon
• komme frem = come out, appear, emerge

And here are the forms used in the sentence:

• skyerne = definite plural of sky
• forsvinder = present tense of forsvinde
• månen = definite singular of måne
• kommer = present tense of komme

A natural past-tense version would be:

• Da skyerne forsvandt, kom månen frem.

Changes:

• når becomes da for a specific past event
• forsvinder becomes forsvandt
• kommer becomes kom

So:

• present/general: Når skyerne forsvinder, kommer månen frem
• past/specific: Da skyerne forsvandt, kom månen frem

Skyerne can be tricky because it has several vowels close together.

It is roughly pronounced like SKOO-er-ne or SKY-er-ne, depending on how detailed your pronunciation guide is, but the exact Danish sound is not the same as English.

What makes it difficult for English speakers:

• the y sound in Danish is not like normal English y
• the ending -erne can sound reduced in fast speech
• the word has more syllables than it may first appear to have

A helpful way to think of it is:

• sky
• -er
• -ne

So it is built from the plural plus the definite ending.

It is common and natural, but it is not the only possible expression.

For the moon or sun becoming visible, Danish often uses expressions like:

• månen kommer frem = the moon comes out / appears
• solen kommer frem = the sun comes out

So yes, it is very natural here.

But komme frem can also be used more generally, for example for information, ideas, or objects appearing or becoming visible. Its exact English translation depends on context.