Hvis jeg taber min billet, samler jeg den op med det samme.

In Danish, the present tense is often used for general conditions and future situations, especially after hvis (if).

So Hvis jeg taber min billet means If I lose my ticket, even though the losing would happen in the future or as a possibility.

This is very similar to English:

• If I lose my ticket, ... not
• If I will lose my ticket, ...

So the Danish present tense here is completely normal.

Hvis means if and introduces a conditional clause.

In this sentence:

• Hvis jeg taber min billet = If I lose my ticket

It sets up the condition for what happens next:

• samler jeg den op med det samme = I pick it up right away

So the whole sentence follows the pattern:

• Hvis + condition, main clause

This is because Danish uses verb-second word order in main clauses.

When a subordinate clause comes first, like:

• Hvis jeg taber min billet,

then the main clause follows, and the finite verb comes before the subject:

• samler jeg den op med det samme

So Danish word order becomes:

• Hvis ..., samler jeg ...

not

• Hvis ..., jeg samler ...

This is a very important Danish pattern:

• Når jeg kommer hjem, laver jeg mad.
• Hvis det regner, bliver vi hjemme.

The comma separates the if-clause from the main clause.

So:

• Hvis jeg taber min billet, = subordinate clause
• samler jeg den op med det samme. = main clause

In Danish, this comma is standard in sentences like this and helps show the structure clearly.

Because billet is a common gender noun in Danish.

You can see this from:

• en billet = a ticket

Common gender nouns are referred to with:

• den

Neuter nouns, which take et, are referred to with:

• det

So:

• en billet → den
• et hus → det

That is why min billet becomes den later in the sentence.

Min billet means my ticket and introduces the noun.

After that, Danish uses den to refer back to it, just like English uses it:

• Hvis jeg taber min billet, samler jeg den op ...
• If I lose my ticket, I pick it up ...

So den avoids repeating min billet.

Samle op is a fixed verb expression meaning pick up.

The basic verb is:

• samle = gather, collect

But with op, it gets the meaning:

• samle op = pick up

In main clauses, Danish often splits this kind of verb expression:

• Jeg samler den op.

But in some other structures, the parts stay together:

• at samle den op
• jeg vil samle den op

So samler ... op works a bit like a separable phrasal verb.

Yes, in many situations miste and tabe can both relate to losing something, but they are not always identical.

• tabe often suggests dropping something or losing possession of it
• miste often means losing something in a broader sense

In this sentence, taber min billet can sound natural if the idea is that you physically drop the ticket. That fits well with samler jeg den op (I pick it up).

If you said:

• Hvis jeg mister min billet ...

that could sound more like the ticket is lost in general, not necessarily dropped on the ground. So taber matches pick it up especially well here.

Med det samme means immediately, right away, or at once.

It is a common Danish expression.

In this sentence:

• samler jeg den op med det samme means
• I pick it up right away

It emphasizes that the action happens without delay.

Both are possible, and both can mean immediately.

• med det samme = right away / immediately
• straks = immediately / at once

Med det samme often sounds very natural in everyday speech. Straks is also common, but can sometimes sound a little more direct or formal depending on context.

So:

• samler jeg den op med det samme and
• samler jeg den straks op

are both possible, but the first one is very idiomatic and conversational.

In Danish main clauses, when you have a verb like samle op, the object usually comes between the verb and the particle:

• Jeg samler den op.

So the pattern is often:

• verb + object + particle

That is why you get:

• samler jeg den op

rather than:

• samler jeg op den

The version with op den would sound wrong here.

Yes. You can say:

• Jeg samler den op med det samme, hvis jeg taber min billet.

This means the same thing.

The difference is mostly one of focus and style:

• starting with Hvis ... highlights the condition first
• starting with Jeg ... highlights the action first

Both are grammatical.

It can be understood as a general rule or what I would do in that situation.

Because both verbs are in the present tense, the sentence sounds like:

• If I lose my ticket, I pick it up immediately or more naturally in English:
• If I drop my ticket, I pick it up right away

So it is not necessarily about one specific future event. It can describe a typical reaction or a general statement about what happens in that situation.