Vi har jo allerede købt billetterne, så vi burde gå hjemmefra nu.

Har købt is the present perfect in Danish, like have bought in English.

• Vi har købt billetterne = We have bought the tickets
• Vi købte billetterne = We bought the tickets

In this sentence, the speaker is referring to something already completed that is relevant right now: because the tickets have already been bought, it makes sense to leave now.

So har købt fits the idea of a past action with present relevance.

Jo is one of those very common Danish particles that can be hard to translate directly.

In this sentence, jo adds the feeling of:

• as you know
• after all
• you know
• obviously / as we both know

So:

• Vi har jo allerede købt billetterne
  means something like
  We’ve already bought the tickets, after all
  or
  We’ve already bought the tickets, you know

It often reminds the listener of something that is already known or should be obvious in the conversation.

In Danish, adverbs like allerede often go between the auxiliary verb and the past participle.

So the pattern is:

• har allerede købt

This is very normal word order in Danish.

Compare:

• Vi har allerede købt billetterne = We have already bought the tickets

You may also hear different placements in speech for emphasis, but har allerede købt is the standard and most natural version here.

In Danish, the definite article is usually added to the end of the noun.

So:

• en billet = a ticket
• billetter = tickets
• billetterne = the tickets

This is one of the biggest differences from English. Instead of saying the tickets with a separate word, Danish usually says tickets-the as one word.

Burde means should / ought to.

So:

• vi burde gå hjemmefra nu = we should leave home now / we ought to head out now

It suggests that leaving now is the sensible or appropriate thing to do.

It is softer than a strict command. Compare:

• vi skal gå hjemmefra nu = we have to leave now / we must leave now
• vi burde gå hjemmefra nu = we should leave now

So burde expresses recommendation or logical conclusion rather than absolute necessity.

That is a very good question. In Danish, some modal verbs have forms that look historically like past forms, but they are often used with present-time meaning.

Burde commonly means should / ought to in present situations:

• Du burde spise noget = You should eat something
• Vi burde gå nu = We should leave now

So even though it may look “past-like,” here it does not mean that they should have left earlier. It means that leaving now is the right idea.

If you wanted should have in Danish, you would usually need a different structure, such as:

• Vi burde være gået hjemmefra tidligere = We should have left home earlier

Literally, gå often means walk, but in many expressions it can also mean go or leave.

Gå hjemmefra means:

• leave home
• head out from home

It does not necessarily mean they are walking. They could be leaving by car, bus, bike, or on foot. The important idea is departing from home.

So in this sentence, gå hjemmefra nu is best understood as leave home now.

Hjemmefra is a fixed adverb meaning from home.

It is built from:

• hjemme = at home
• fra = from

But together, hjemmefra is very commonly written as one word.

Compare:

• Jeg arbejder hjemme = I work at home
• Jeg tager hjemmefra klokken otte = I leave home at eight

So here, gå hjemmefra is a standard expression.

In this sentence, så means so, and it is being used as a coordinating conjunction. After a coordinating conjunction, Danish usually keeps normal main-clause word order:

• så vi burde gå hjemmefra nu

That is why you get:

• subject + verb = vi burde

This is similar to English:

• ..., so we should leave now

If the second part began with another element placed first for emphasis, then inversion could happen. But after plain så as a conjunction, vi burde is normal.

Sometimes så can mean then, but here so is the best translation.

The logic is:

• We have already bought the tickets,
• so we should leave home now.

Here så introduces a conclusion or consequence. That is exactly how so works in English.

Nu means now, and Danish often places time adverbs like this quite naturally toward the end of the clause.

So:

• vi burde gå hjemmefra nu = we should leave home now

This sounds very natural in Danish.

You could move adverbs around in some cases for emphasis, but nu at the end is the most straightforward and idiomatic placement here.

Yes. The sentence would still be grammatically correct without it:

• Vi har allerede købt billetterne, så vi burde gå hjemmefra nu.

Without jo, the sentence is more neutral and direct.

With jo, the speaker sounds as if they are reminding the listener of something already known:

• We’ve already bought the tickets, you know / after all, so...

So jo is optional for grammar, but it changes the tone.

It is neutral, everyday Danish.

Nothing in it is especially formal or especially slangy. Words like jo, allerede, burde, and hjemmefra are all very common in normal conversation.

The only thing to notice is that jo makes it sound a bit more conversational and natural, because speakers often use particles like that in real life.

Yes, in some contexts you may hear:

• Vi burde tage hjemmefra nu

This also means We should leave home now.

Very roughly:

• gå hjemmefra focuses on going/leaving
• tage hjemmefra can also mean set off / head out

Both are possible, and the difference is often small in everyday speech. In your sentence, gå hjemmefra is completely natural.