Det er ikke normalt, at bussen er så forsinket.

Normal is the basic adjective form, but Danish adjectives often change form depending on what they describe.

Here, the subject is det, which is grammatically neuter singular, so the adjective takes -t:

normal → normalt

That is why you get Det er normalt.

This is very common after impersonal det er ... expressions:

• Det er godt
• Det er svært
• Det er normalt

Danish often uses det as an impersonal or dummy subject, just like English it in sentences such as It is not normal that...

So Det er ikke normalt, at... means something like It is not normal that...

You could also build the sentence around the clause itself:

At bussen er så forsinket, er ikke normalt.

That is grammatical, but it sounds heavier and less natural in everyday Danish. The version with Det er is the normal choice.

In a Danish main clause, the finite verb usually comes early, and ikke normally comes after that finite verb.

So:

• Det er ikke normalt

not:

• Det ikke er normalt

This is a very important Danish word-order rule.

Compare:

• Han kommer ikke i dag.
• Vi er ikke klar.

But inside a subordinate clause, ikke often comes before the finite verb:

• ..., at bussen ikke er forsinket

So main clauses and subordinate clauses behave differently.

Here at is a conjunction meaning that.

It introduces the subordinate clause:

at bussen er så forsinket

So the structure is:

Det er ikke normalt + at bussen er så forsinket

In English, that is often optional:

• It is not normal that the bus is so delayed
• It is not normal the bus is so delayed is not natural English, so English usually restructures it

In Danish, at is the normal way to introduce this kind of clause.

In this sentence, at should normally be included.

With the pattern Det er + adjective + at-clause, Danish standard usage expects at:

• Det er ikke normalt, at bussen er så forsinket.

Leaving it out would sound unnatural or nonstandard in this structure.

So for learners, the safe rule is: after Det er + adjective, keep at before the clause.

The comma marks the beginning of the subordinate clause:

Det er ikke normalt, at bussen er så forsinket.

In Danish, many writers put a comma before subordinate clauses like this. However, modern Danish also allows a style without that comma.

So both of these can be acceptable, depending on comma style:

• Det er ikke normalt, at bussen er så forsinket.
• Det er ikke normalt at bussen er så forsinket.

Learners will often see the comma, especially in teaching materials and careful writing.

In Danish, the definite article is usually attached to the end of the noun.

So:

• en bus = a bus
• bussen = the bus

This is one of the biggest differences from English.

You use a separate word such as den only in certain situations, especially with adjectives:

• den forsinkede bus = the delayed bus

But by itself, the bus is simply bussen.

Because at bussen er så forsinket is a subordinate clause.

After at, Danish normally uses a more straightforward order: subject + verb

So:

• at bussen er så forsinket

not:

• at er bussen så forsinket

The verb-second pattern that Danish uses in main clauses does not apply in the same way after at.

This contrast is very useful to learn:

Main clause:

• Bussen er så forsinket.

Subordinate clause:

• ..., at bussen er så forsinket.

In this case, the order looks the same, but the grammar behind it is different.

Here så means so in the sense of to such a degree.

So:

• så forsinket = so delayed

It intensifies the adjective forsinket.

This is the same så you see in sentences like:

• Hun er så træt. = She is so tired.
• Det er så dyrt. = It is so expensive.

It does not mean then here.

Forsinket is the past participle of the verb at forsinke, but in this sentence it functions like an adjective.

So er forsinket means is delayed.

This is very common in Danish:

• Toget er forsinket.
• Flyet er forsinket.
• Bussen er forsinket.

Even though the form comes from a verb, in sentences like this it behaves much like an adjective describing a state.

Sometimes yes, but forsinket is the most natural choice for public transport being delayed.

• Bussen er forsinket = the bus is delayed
• Bussen er for sen can sound more like the bus is too late or later than it should be

For buses, trains, planes, and similar situations, forsinket is the standard and safest word to use.