Hendes forklaring var god, men jeg er stadig i tvivl om, hvorfor hun kom så sent.

Hendes means her. It is the possessive form used when something belongs to a female person: hendes forklaring = her explanation.

A learner may wonder why it is not sin. In Danish, sin/sit/sine is usually used when the possessor is the subject of the same clause. Here, hendes refers to hun later in the sentence, but it is not inside the same clause as hun in a way that would call for sin. So hendes forklaring is the natural choice.

Because Danish often leaves out the indefinite article after a possessive.

So:

• hendes forklaring = her explanation
• not usually hendes en forklaring

This works like English: we say her explanation, not her an explanation.

They belong to different parts of the sentence and describe different times or states:

• Hendes forklaring var god = Her explanation was good
• jeg er stadig i tvivl = I am still in doubt / I still have doubts

So the explanation is being judged as something in the past, while the speaker’s doubt is still true now. Danish uses the same tense logic here that English does.

I tvivl is a fixed expression meaning in doubt, unsure, or not certain.

Examples:

• Jeg er i tvivl. = I am unsure.
• Jeg er i tvivl om det. = I am unsure about that.

In this sentence, jeg er stadig i tvivl om ... means the speaker still does not feel certain.

The om belongs to the expression at være i tvivl om = to be in doubt about.

So the structure is:

• jeg er i tvivl om ... = I am in doubt about ...

After that, the speaker adds what they are unsure about:

• hvorfor hun kom så sent = why she arrived so late

So om is not really there because of hvorfor itself; it is there because of i tvivl om.

Because this is an embedded question, not a direct question.

Compare:

• Direct question: Hvorfor kom hun så sent? = Why did she arrive so late?
• Embedded question: ... hvorfor hun kom så sent. = ... why she arrived so late.

In embedded questions, Danish usually uses normal subordinate-clause word order, where the subject comes before the verb:

• hun kom
• not kom hun

This is very important in Danish grammar.

Stadig means still.

In jeg er stadig i tvivl, it comes after the verb er, which is very common in Danish main clauses. Danish word order often places the finite verb early in the sentence, and adverbs like stadig often come after it.

So:

• jeg er stadig i tvivl = I am still in doubt

That placement sounds natural and standard.

Så sent means so late.

• sent = late
• så = so

Together they express degree: so late.

Examples:

• Han kom sent. = He arrived late.
• Han kom så sent. = He arrived so late.

Here, the speaker is not just saying she was late, but that the lateness was significant enough to remain questionable.

Both can mean came/arrived, but kom is much more common and natural in everyday Danish.

• hun kom så sent = she came / arrived so late
• hun ankom så sent is possible, but sounds a bit more formal or specific

Danish often uses komme where English might strongly prefer arrive.

Because hvorfor hun kom så sent is a subordinate clause.

Danish uses commas to mark subordinate clauses much more consistently than English does. So the comma before hvorfor is normal and expected in written Danish.

The sentence is divided like this:

• Hendes forklaring var god
• men jeg er stadig i tvivl om
• hvorfor hun kom så sent

That last part is the subordinate clause.

Yes, but the meaning changes.

• så sent = so late
• for sent = too late

So:

• hvorfor hun kom så sent asks why she arrived at such a late time
• hvorfor hun kom for sent would suggest she arrived later than she should have, meaning she was tardy

In this sentence, så sent fits better because the speaker is wondering about the reason for the very late arrival, not necessarily saying it was excessively late in relation to a deadline.

Yes, very much so.

In this sentence:

• Hendes forklaring var god, men ...
• Her explanation was good, but ...

It introduces a contrast. The speaker admits something positive about the explanation, then adds that doubt remains anyway.

A very useful way is:

• Hendes forklaring var god
• men jeg er stadig i tvivl om
• hvorfor hun kom så sent

This helps you see the structure:

1. a statement
2. a contrast
3. an embedded question

That chunking makes the sentence much easier to understand and produce.