Det tager tid at skabe tillid på kontoret.

In this sentence, det is a dummy subject, just like English it in It takes time.

It does not refer to a specific thing. Danish often uses det in impersonal expressions:

• Det tager tid = It takes time
• Det er vigtigt = It is important
• Det regner = It is raining

So here, det is there because Danish syntax requires a subject.

Tager is the present tense of tage = to take.

So:

• tage = to take
• tager = takes / is taking
• tog = took
• har taget = has taken

In Det tager tid, the expression means It takes time.

This is a very common structure in Danish:

• Det tager lang tid = It takes a long time
• Det tager kun fem minutter = It only takes five minutes

Because at skabe is the infinitive form, meaning to create or to build.

In this sentence, the phrase at skabe tillid på kontoret works like to create trust in the office. It explains what takes time.

So the structure is:

• Det tager tid = It takes time
• at skabe tillid på kontoret = to create trust in the office

Together:

• Det tager tid at skabe tillid på kontoret.

Skabe literally means create, but in this sentence it is often best understood as build, establish, or develop.

With tillid (trust), English often says:

• build trust
• establish trust

Danish commonly says:

• skabe tillid

So skabe is perfectly natural here, even if a more idiomatic English translation might use build rather than create.

Because tillid is usually used as an abstract uncountable noun, much like English trust.

Compare:

• skabe tillid = create/build trust
• have tillid = have trust / trust
• miste tillid = lose trust

You do not normally need en here.

If you make it definite, you can say:

• tilliden = the trust

But in this sentence, the general idea of trust is meant, so plain tillid is the natural choice.

It is an en-word:

• en tillid
• tilliden

However, because it is usually abstract and uncountable, learners often meet it without the article:

• have tillid
• vise tillid
• skabe tillid

So yes, grammatically it is an en-word, but in many common phrases the article is simply not used.

This is a very common learner question.

På kontoret usually means at the office or in the office/workplace context.

Danish often uses på with workplaces, institutions, and similar places:

• på kontoret = at the office
• på skolen = at the school
• på hospitalet = at the hospital

By contrast, i kontoret would more strongly suggest inside the office room itself, focusing on physical location.

So in your sentence, på kontoret sounds natural because it means something like in the office environment / at work.

Kontoret is the definite singular form of kontor:

• et kontor = an office
• kontoret = the office

Danish usually adds the definite article as an ending:

• en bil → bilen
• et hus → huset
• et kontor → kontoret

So på kontoret means at the office / in the office.

If you said på et kontor, that would mean in an office / at an office in a more indefinite sense.

The structure is:

• Det = subject
• tager = verb
• tid = object/complement
• at skabe tillid på kontoret = infinitive phrase explaining what takes time

So the sentence breaks down as:

• Det tager tid = It takes time
• at skabe tillid på kontoret = to create trust in the office

This is very similar to English:

• It takes time to build trust at the office.

Yes, but the normal neutral order here is:

• Det tager tid at skabe tillid på kontoret.

If you move something to the front for emphasis, Danish uses verb-second word order:

• På kontoret tager det tid at skabe tillid.

Notice that tager stays in second position, and det comes after it.

That kind of fronting is possible, but the original version is the most straightforward and neutral.

It can cover both ideas, depending on context.

In English, we often distinguish:

• at the office = workplace location in a general sense
• in the office = physically inside the office

Danish på kontoret often matches at the office best, but in many contexts English would still naturally translate it as in the office.

So the Danish phrase is a bit broader than a one-to-one English equivalent.

Yes. Some other natural Danish expressions are:

• opbygge tillid = build trust
• vinde tillid = gain trust
• have tillid = have trust / trust
• få tillid til nogen = come to trust someone

Compared with skabe tillid, opbygge tillid may feel a little closer to English build trust. But skabe tillid is still very natural and correct.

A rough pronunciation guide is:

De ta-er ti at sga-be til-lid po kon-to-ret

A few notes:

• det is often pronounced more like de in connected speech
• tager often sounds like ta-er
• tid has a long vowel
• skabe begins with sk pronounced like a hard sg/k sound before the vowel
• på has an aw/o-like vowel
• kontoret is stressed roughly on the last part: kon-to-RET

A more natural connected pronunciation will be smoother than the spelling suggests.