Om det regner eller blæser, går fuglen stadig til reden med mad til sine unger.

Here om means whether in the pattern whether ... or ....

So Om det regner eller blæser means something like whether it rains or it’s windy. In the full sentence, it gives a no matter whether idea: the bird keeps going to the nest anyway.

A more explicit version could be uanset om det regner eller blæser = regardless of whether it rains or it’s windy.

Because the same subject is understood for both verbs.

Danish often leaves out a repeated subject when two verbs are joined by eller or og and the subject is the same. So:

• det regner eller blæser

is understood as:

• det regner eller det blæser

The shorter version is more natural here.

It is a dummy subject, just like English it in it rains.

The det does not refer to any actual thing. It is simply required by the grammar of weather expressions:

• det regner = it rains / it is raining
• det blæser = it blows / it is windy

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

The whole opening clause Om det regner eller blæser takes the first position. That means the verb of the main clause must come next:

• Om det regner eller blæser, går fuglen stadig til reden ...

If there were no opening clause, you would normally say:

• Fuglen går stadig til reden ...

Because Om det regner eller blæser is a subordinate clause placed before the main clause.

In standard Danish writing, a comma is usually placed between the subordinate clause and the main clause:

• Om det regner eller blæser, går fuglen ...

So the comma helps mark the boundary between the two parts of the sentence.

Stadig means still.

Here it shows that the bird continues to go to the nest despite the weather. So the idea is:

• it is raining or windy
• but the bird still goes to the nest

It is not just about time; it also gives a sense of persistence.

That is the normal word order in a Danish main clause.

After the finite verb and subject, sentence adverbs like stadig often come next:

• går fuglen stadig til reden

So the order is:

• fronted element: Om det regner eller blæser
• finite verb: går
• subject: fuglen
• adverb: stadig

Because til shows movement toward a destination: to the nest.

• til reden = to the nest
• i reden = in the nest

So if the bird is going there, til is right. If the bird is already located there, you would use i:

• Fuglen er i reden = The bird is in the nest

Because reden is the definite form: the nest.

The sentence is talking about a specific nest, understood from the context as the bird’s nest. If it were introducing a nest for the first time in a more indefinite way, you might see en rede.

You could also say sin rede if you wanted to stress that it is the bird’s own nest.

Because sine is a reflexive possessive. It refers back to the subject of the clause, which is fuglen.

So:

• sine unger = its own young

This is exactly the kind of situation where Danish uses sin / sit / sine.

By contrast, dens unger would normally suggest the young belong to some other thing, not to the subject itself.

Because the possessed noun unger is plural.

The forms are:

• sin for common gender singular
• sit for neuter singular
• sine for plural

So:

• sin unge = its young one
• sit æg = its egg
• sine unger = its young

It can definitely be used for animals too.

In this sentence, unger means young, offspring, or more specifically for birds, often chicks in English.

So sine unger here means its young or its chicks.

In weather language, blæser means it is windy or the wind is blowing.

Literally, the verb is related to blow, but in natural English you would often translate det blæser as:

• it’s windy
• the wind is blowing

So regner eller blæser is a very common kind of weather pairing: raining or windy.

Because Danish often uses the present tense for things that are generally true, habitual, or repeatedly happening.

So this sentence does not have to mean the bird is going right this second. It can also mean this is what the bird does as a regular pattern:

• even in bad weather, it keeps bringing food to its young

Går is understandable as a general verb meaning goes, but flyver would often sound more natural if you are thinking of a bird’s actual movement.

So:

• går til reden = goes to the nest
• flyver til reden = flies to the nest

The given sentence is grammatically fine, but many speakers might choose flyver if they want the most realistic wording.

Because the two prepositions do different jobs.

• med mad = with food, carrying food
• til sine unger = for its young, intended for its young

So the phrase means the bird goes to the nest carrying food for its young.