Vi går ind på caféen, hvis det begynder at regne.

Danish often uses the present tense to talk about the future when the context makes the future meaning clear.

So Vi går ind på caféen, hvis det begynder at regne literally uses present tense, but in natural English it can mean We’ll go into the café if it starts raining.

The hvis-clause already tells you this is about a future possibility, so Danish does not need a separate future form here.

It can be literally walk in, but in everyday Danish it often works more like English go in or go inside.

So here, går ind does not strongly emphasize walking. It just means entering the café.

With places like cafés, shops, schools, and offices, Danish very often uses ind på when talking about going into them as places or establishments.

• ind på caféen = the normal, idiomatic way to say into the café
• ind i caféen = more focused on the physical interior space

So ind på caféen is the natural choice here.

Because caféen is the definite form: the café.

In Danish, the definite article is often added to the end of the noun:

• en café = a café
• caféen = the café

So the sentence is talking about a specific café, not just any café.

Hvis means if and is used for a condition or possibility.

• hvis det begynder at regne = if it starts raining

Når means when, and it usually sounds more certain or expected.

So:

• hvis = if it happens
• når = when it happens

In this sentence, rain is being treated as a possibility, so hvis is the better choice.

In Danish, weather expressions usually need a dummy subject: det.

For example:

• det regner = it is raining
• det sner = it is snowing
• det blæser = it is windy / it is blowing

This det does not refer to a specific thing. It is just there because Danish grammar requires a subject.

Because begynde is commonly followed by at + infinitive.

So:

• begynder at regne = begins to rain
• begynder at spise = begins to eat
• begynder at løbe = begins to run

This is a very common pattern in Danish.

Because hvis det begynder at regne is a subordinate clause.

In Danish subordinate clauses, the subject normally comes before the finite verb:

• det begynder

Danish verb-second word order mainly applies to main clauses, not to clauses introduced by words like hvis.

Yes, absolutely.

That version is also correct:

Hvis det begynder at regne, går vi ind på caféen.

Notice what happens in the main clause after the hvis-clause comes first:

• går vi
• not vi går

That is because Danish main clauses follow verb-second word order. When the first position is taken by Hvis det begynder at regne, the verb går comes before the subject vi.

It depends on which Danish comma system is being used.

Many people write:

Vi går ind på caféen, hvis det begynder at regne.

Others may write:

Vi går ind på caféen hvis det begynder at regne.

Both can be accepted in modern Danish.

But if the hvis-clause comes first, you do need the comma after it:

Hvis det begynder at regne, går vi ind på caféen.

The accent is part of the spelling of the base word café, and it stays when endings are added.

So:

• café
• caféen
• caféer
• caféerne

The accent helps show the stressed final -é sound.