På tirsdag har jeg en kort arbejdsdag, fordi jeg skal møde min søster om aftenen.

Because Danish main clauses usually follow the V2 rule: the finite verb must come in the second position.

So in:

På tirsdag har jeg en kort arbejdsdag

the first element is På tirsdag, and the verb har must come next. After that comes the subject jeg.

A basic version would be:

Jeg har en kort arbejdsdag på tirsdag.

When you move På tirsdag to the front for emphasis, the verb stays in second position:

På tirsdag har jeg en kort arbejdsdag.

På tirsdag means on Tuesday.

In Danish, på is commonly used with days of the week, much like on in English:

• på mandag = on Monday
• på tirsdag = on Tuesday
• på fredag = on Friday

So this part is very natural for an English speaker to connect with on Tuesday.

Yes, sometimes Danish can omit på with days, especially in speech or certain styles:

• Tirsdag har jeg en kort arbejdsdag
• På tirsdag har jeg en kort arbejdsdag

Both can be understood as Tuesday / On Tuesday, I have a short workday.

However, på tirsdag is very common and often sounds especially natural when talking about a specific upcoming Tuesday.

This means a short workday.

Here is the breakdown:

• en = a
• kort = short
• arbejdsdag = workday / working day

Arbejdsdag is a common-gender noun, so it takes en, not et.

Also, the adjective appears as kort, which is the basic form used with an en-word in the singular indefinite:

• en kort dag
• en kort arbejdsdag

Arbejdsdag is a compound noun:

• arbejde = work
• dag = day

Together, arbejdsdag means workday or working day.

Danish uses compound nouns very often, just like German. English sometimes writes these as one word, two words, or with a hyphen, but Danish very often writes them as a single word.

Other examples:

• arbejdstid = working time / work hours
• sommerferie = summer holiday
• fødselsdag = birthday

Because fordi introduces a subordinate clause, and in standard Danish spelling, that clause is separated with a comma.

So:

På tirsdag har jeg en kort arbejdsdag, fordi jeg skal møde min søster om aftenen.

Here:

• main clause: På tirsdag har jeg en kort arbejdsdag
• subordinate clause: fordi jeg skal møde min søster om aftenen

English also often uses a comma before because in some situations, but Danish comma rules are their own system, and learners often notice commas more clearly in sentences like this.

Because after fordi, Danish uses subordinate clause word order.

In a subordinate clause, the subject usually comes before the finite verb:

• fordi jeg skal møde min søster
• fordi han kommer senere
• fordi vi har travlt

That is different from the V2 pattern in main clauses.

So compare:

• Main clause: På tirsdag har jeg en kort arbejdsdag
• Subordinate clause: fordi jeg skal møde min søster

This contrast is very important in Danish grammar.

Here, skal møde means something like am going to meet or have to meet, depending on context.

• skal is a modal verb
• møde means meet

In this sentence, skal most likely expresses a planned arrangement or intention:

jeg skal møde min søster om aftenen
= I’m going to meet my sister in the evening

It can sometimes sound stronger, like I have to meet my sister, but in everyday Danish it often simply refers to something planned.

In Danish, møde usually takes a direct object when you mean meeting a person:

• jeg møder min ven
• hun møder sin lærer
• vi skal møde min søster

So møde min søster is completely normal and literally follows the pattern meet my sister.

If you want a sense closer to meet up with, Danish can sometimes use other expressions, but møde nogen is the standard basic structure.

Because Danish possessives work similarly to English here.

• min søster = my sister
• din søster = your sister
• hans søster = his sister

You normally do not add the definite ending when a possessive is already there.

So:

• søsteren = the sister
• min søster = my sister

Not: min søsteren

Om aftenen means in the evening.

In this sentence, it refers to the time of day when the meeting will happen.

There is an important difference:

• om aftenen = in the evening / during the evening
• i aften = tonight

So:

• Jeg skal møde min søster om aftenen = I’m going to meet my sister in the evening
• Jeg skal møde min søster i aften = I’m going to meet my sister tonight

In many contexts, i aften would sound more specific and immediate. Om aftenen can sound a bit more neutral or descriptive.

Usually, yes. In everyday Danish, på tirsdag often means this coming Tuesday or next Tuesday, depending on where you are in the week and the context.

Like in English, the exact interpretation can sometimes depend on the situation. If needed, Danish can be more explicit:

• førstkommende tirsdag = this coming Tuesday
• næste tirsdag = next Tuesday

But on its own, på tirsdag is a very normal way to refer to a specific Tuesday that both speaker and listener can identify from context.

Yes, absolutely.

That version is also correct:

Jeg har en kort arbejdsdag på tirsdag, fordi jeg skal møde min søster om aftenen.

The difference is mainly focus:

• På tirsdag har jeg... puts extra attention on Tuesday
• Jeg har... på tirsdag sounds a bit more neutral

Both are natural Danish.