I dag lærer vi udtrykket “have det med at”, som vi bruger, når noget ofte sker på samme måde.

Because Danish is a verb-second language in main clauses.

When a sentence begins with something other than the subject, such as I dag (today), the finite verb must come next:

• I dag lærer vi ...
• not I dag vi lærer ...

Compare:

• Vi lærer udtrykket i dag.
• I dag lærer vi udtrykket.

In both sentences, the verb lærer stays in the second position.

Udtryk means expression or phrase.
Udtrykket means the expression.

The ending -et is the Danish way of making many neuter nouns definite:

• et udtryk = an expression
• udtrykket = the expression

So in the sentence, udtrykket have det med at means the expression have det med at.

Because det is a fixed part of the expression.
In have det med at, the word det does not have a strong independent meaning here; it belongs to the idiom.

So learners should treat have det med at as one chunk:

• Jeg har det med at glemme mine nøgler.
• Hun har det med at komme for sent.

If you remove det, it no longer sounds correct in this meaning.

The usual pattern is:

subject + have + det med at + infinitive

Examples:

• Jeg har det med at tale for hurtigt.
  = I tend to speak too fast.
• Han har det med at glemme aftaler.
  = He tends to forget appointments.
• De har det med at blive hjemme.
  = They tend to stay home.

So after at, you normally use a verb in the infinitive.

You conjugate the verb have, while the rest stays the same.

Common forms:

• jeg har det med at ...
• du har det med at ...
• han/hun har det med at ...
• vi har det med at ...
• de har det med at ...

Past tense:

• jeg havde det med at ...

Perfect:

• jeg har haft det med at ...

Examples:

• Jeg havde det med at bekymre mig for meget.
• Hun har haft det med at afbryde folk.

Som means that / which / who in relative clauses.

Here it connects udtrykket with extra information about it:

• udtrykket, som vi bruger ...
• = the expression, which we use ...

So som vi bruger describes udtrykket.

You can think of it as:

• the expression that we use

Because standard Danish spelling uses a comma before many subordinate clauses, including relative clauses introduced by som.

So:

• ... udtrykket, som vi bruger ...

This is normal Danish punctuation.

English punctuation is often less regular in the same kind of sentence, so this may feel unusual to English speakers.

In Danish word order, ofte usually comes after the subject in this kind of subordinate clause.

So the normal order is:

• når noget ofte sker ...

Here:

• når = when
• noget = something
• ofte = often
• sker = happens

This is the expected placement of the adverb ofte.

Når is used for things that happen generally, repeatedly, or under certain circumstances.

Here the sentence is talking about a general rule:

• we use this expression when something often happens in the same way

That is why når fits well.

A learner may compare it with da, but da is usually used about a specific event in the past, not a general repeated situation.

It literally means in the same way.

In this sentence, it helps explain the kind of repetition involved: something often happens with the same pattern or tendency.

So ofte sker på samme måde suggests repeated behavior or a repeated way things happen.

Yes, very often that is the best translation.

Examples:

• Jeg har det med at overanalysere.
  = I tend to overanalyze.
• Hun har det med at smile, når hun er nervøs.
  = She tends to smile when she is nervous.

Depending on context, it can also feel like:

• be prone to
• have a habit of

But tend to is usually the most natural English equivalent.

Yes. It is often used for habits, tendencies, or repeated patterns, whether positive, negative, or neutral.

Examples:

• Han har det med at hjælpe andre.
  = He tends to help others.
• Jeg har det med at komme for sent.
  = I tend to arrive late.
• Børn har det med at stille mange spørgsmål.
  = Children tend to ask a lot of questions.

So the expression itself is neutral; the context gives it a positive or negative feeling.

Not usually, because they mean different things.

• have det med at = tend to, have a habit of
• være vant til at = be used to

Compare:

• Jeg har det med at stå sent op.
  = I tend to get up late.
• Jeg er vant til at stå tidligt op.
  = I am used to getting up early.

So have det med at describes a tendency, while være vant til at describes something familiar or habitual because of experience.