Hun er usikker på, om hun har tid til at deltage i mødet i morgen.

Because usikker på is the normal Danish pattern for being unsure about something.

• usikker = unsure, uncertain
• på is the preposition that goes with it in this use

So:

• Hun er usikker på det = She is unsure about it
• Hun er usikker på, om... = She is unsure whether...

English does not always use the same preposition, so this is something you usually just learn as a set expression.

Here, om means whether or sometimes if.

It introduces an indirect yes/no question:

• om hun har tid = whether she has time

This is not the same as om meaning about or around in other contexts. In this sentence, it is specifically the word that introduces the clause whether she has time.

Because the second part is a full subordinate clause, and it needs its own subject.

So:

• Hun er usikker på = She is unsure
• om hun har tid = whether she has time

Even though both hun refer to the same person, Danish still says the subject again, just like English does in She is unsure whether she has time.

Because this is a subordinate clause, not a direct question.

In Danish:

• Main clauses often follow V2 word order, where the finite verb comes early.
• Subordinate clauses usually have subject + finite verb order.

So:

• Direct question: Har hun tid? = Does she have time?
• Indirect question: om hun har tid = whether she has time

That is why there is no inversion after om.

Because Danish often uses the present tense for future meaning when the time is already clear from the context.

Here, i morgen tells you the time is in the future, so har can naturally mean has / will have.

This is very common in Danish:

• Jeg kommer i morgen = I am coming tomorrow / I will come tomorrow
• Hun har tid i morgen = She has time tomorrow / She will have time tomorrow

So the present tense is completely normal here.

Because have tid til is a fixed Danish pattern meaning to have time for / to have time to.

When the thing you have time for is an action, Danish commonly uses:

have tid til at + infinitive

So:

• har tid til at deltage = has time to participate / attend

You can think of it as:

• tid til noget = time for something
• tid til at gøre noget = time to do something

English usually just says time to do something, but Danish normally keeps the til.

Because deltage normally takes the preposition i.

So the pattern is:

deltage i noget = participate in something

Examples:

• deltage i mødet = participate in / attend the meeting
• deltage i en diskussion = participate in a discussion

You usually cannot drop the i here. It is part of how the verb is used.

It can mean either, depending on context.

In many everyday situations, especially with meetings, deltage i mødet is often understood as attend the meeting. It does not always imply active participation in the strongest sense.

So in this sentence, a very natural English meaning is:

• She is unsure whether she has time to attend the meeting tomorrow

But participate in the meeting is also a valid, more literal rendering.

Because mødet means the meeting, while et møde means a meeting.

Danish usually adds the definite article to the end of the noun:

• et møde = a meeting
• mødet = the meeting

Here, mødet suggests that the meeting is a specific one that the speaker and listener already know about.

Also, møde is a neuter noun, so the definite ending is -et.

At the end of the sentence, i morgen most naturally refers to mødet, so the usual understanding is the meeting tomorrow.

The sentence structure is very natural in Danish because time expressions often come late in the sentence.

So the most likely reading is:

• She is unsure whether she has time to participate in the meeting tomorrow

In some contexts, final time expressions can feel slightly broad and modify the whole situation, but here most learners should understand it as referring to the meeting.

Because om hun har tid til at deltage i mødet i morgen is a subordinate clause, and many Danish writers place a comma before such clauses.

So the comma helps mark the boundary between:

• Hun er usikker på
• om hun har tid til at deltage i mødet i morgen

You may also see Danish written without this comma, depending on the comma style being used. So the comma here is normal and useful, but you may encounter both versions in real Danish.