Jeg tjekker køreplanen i appen, før jeg går ud af huset.

Tjekker is the present tense form of the verb at tjekke = to check.

In Danish, present tense is often made by adding -r to the infinitive:

• at tjekke = to check
• jeg tjekker = I check / I am checking

So jeg tjekker is the correct finite verb form for I check or I’m checking.

It can mean both.

Danish usually uses the simple present where English might use either:

• I check the timetable
• I am checking the timetable

The exact meaning depends on context. In this sentence, it most naturally means something like I check the timetable before I leave the house.

Køreplanen means the timetable/schedule. The ending -en is the definite article attached to the noun.

So:

• en køreplan = a timetable
• køreplanen = the timetable

Danish often puts the at the end of the noun instead of using a separate word like English does.

Køreplan literally means something like driving plan/run plan, but in normal usage it means:

• timetable
• schedule
• often for buses, trains, or other transport

In this sentence, it most likely refers to the public transport timetable in an app.

I appen literally means in the app, and this is the most natural way to say that you are checking something inside an app.

• i appen = in the app

Danish often uses i where English speakers might also think of on, especially for something contained within a digital environment.

For the same reason as køreplanen: it is definite.

• en app = an app
• appen = the app

So i appen means in the app or in the app I use / in the relevant app.

Før means before.

It connects the main clause and the time clause:

• Jeg tjekker køreplanen i appen = I check the timetable in the app
• før jeg går ud af huset = before I go out of the house

So før introduces a subordinate clause about time.

Because after før, Danish uses normal subordinate clause word order.

The subject comes before the verb:

• før jeg går = before I go

In a main clause, Danish usually has the verb in second position, but subordinate clauses such as ones introduced by før, fordi, når, and at usually do not follow that V2 pattern.

This expression is built in parts:

• går = go / walk
• ud = out
• af = of / out of / from
• huset = the house

Together, gå ud af huset means to go out of the house or more naturally to leave the house/home.

You need both ud and af here:

• ud gives the idea of outward movement
• af connects that movement to the place you are leaving

So gå ud af huset is the natural full expression.

Huset means the house.

In Danish, it is very common to say gå ud af huset when talking about leaving home/the house, even where English might prefer leave the house or leave home.

So:

• hus = house
• huset = the house

It sounds natural in Danish even if English might not always use the in the same way.

Yes.

The Danish present tense can describe:

• something happening now
• a habitual action
• a general routine
• sometimes even a near-future action

So this sentence could mean:

• I’m checking the timetable in the app before I leave the house
• or I check the timetable in the app before leaving the house

Both are possible depending on context.

Yes. At tjekke is a very common modern Danish verb borrowed from English check.

It is fully integrated into Danish grammar:

• at tjekke = to check
• tjekker = check / am checking
• tjekkede = checked
• har tjekket = have checked

So even though it comes from English historically, it behaves like an ordinary Danish verb.

Yes.

If the subordinate clause comes first, the main clause must still keep the verb in second position, so the subject and verb invert in the main clause.

Original order:

• Jeg tjekker køreplanen i appen, før jeg går ud af huset.

With the før clause first:

• Før jeg går ud af huset, tjekker jeg køreplanen i appen.

Notice the change from jeg tjekker to tjekker jeg in the main clause.

Ø is a separate Danish vowel, not just an o with decoration. English does not have an exact equivalent, so learners often need practice with it.

Køreplanen is roughly pronounced like:

• KØ-re-plan-en

A very rough guide for English speakers:

• kø has a rounded vowel somewhat like the vowel in French deux or German schön
• re is light and unstressed
• planen sounds like play-nən with Danish vowel qualities

You do not need perfect pronunciation immediately, but it is important to recognize that ø changes the sound completely.

Yes, often you can.

Both før and inden can mean before. In many everyday contexts they are interchangeable.

So this would also work:

• Jeg tjekker køreplanen i appen, inden jeg går ud af huset.

There can be small stylistic or contextual differences in some cases, but for a learner, both are good and natural here.