Min sadel er blevet våd, så jeg tørrer den af, før jeg cykler.

Both are possible, but they emphasize slightly different things.

• Min sadel er våd = My saddle is wet.
  This simply describes its current state.
• Min sadel er blevet våd = My saddle has become/gotten wet.
  This highlights the change: it was dry before, and now it is wet.

So in this sentence, er blevet våd makes the situation feel a bit more dynamic and natural: the saddle has gotten wet, so now I wipe it off.

Because the verb blive normally forms its perfect tense with være:

• jeg bliver = I become / I am getting
• jeg er blevet = I have become / I have gotten

So:

• Min sadel er blevet våd = My saddle has gotten wet

This is just a pattern you need to learn with blive.

Because sadel is a common gender noun (en sadel), and the adjective agrees with it.

• en sadel → våd
• et noun would usually take -t in the singular:
  • et håndklæde er vådt = a towel is wet

So:

• Min sadel er blevet våd is correct because sadel is an en-word.

Because den refers back to a common gender noun, and det refers back to a neuter noun.

• en sadel → den
• et håndklæde → det

So:

• Min sadel ... jeg tørrer den af
• not jeg tørrer det af

This is the same gender distinction you see in en vs et.

It means wipe it off or dry it off.

The verb here is the particle verb tørre af:

• at tørre noget af = to wipe something off / dry something off

So:

• jeg tørrer den af = I wipe it off

In this sentence, den refers to the saddle.

Because with many Danish verb + particle combinations, a short object pronoun like den, det, ham, hende usually goes between the verb and the particle.

So:

• jeg tørrer den af = correct
• jeg tager den på
• jeg skriver det ned

With a full noun, Danish often uses:

• jeg tørrer sadlen af

So the pronoun placement in tørrer den af is very normal.

Yes, you could, but it sounds a bit different.

• jeg tørrer den af is very natural, everyday Danish
• jeg aftørrer den is also correct, but it can sound a bit more formal or more written

In ordinary conversation, tørre ... af is often the more natural choice.

Here så means so, introducing the result or consequence.

• Min sadel er blevet våd, så jeg tørrer den af
  = My saddle has gotten wet, so I wipe it off

This så connects two main clauses:

1. Min sadel er blevet våd
2. jeg tørrer den af

It is not the same as every possible use of så in Danish, since så can also mean things like then or such/so depending on context.

Because Danish often uses the present tense after time words like før, når, and efter, even when English might think of the action as future.

So:

• før jeg cykler literally looks like before I cycle
• but in natural English it means before I ride off / before I bike

This is very common:

• Jeg spiser, før jeg går. = I’ll eat before I leave.
• Ring til mig, når du kommer. = Call me when you arrive.

So the present tense after før is normal Danish grammar.

Because før introduces a subordinate clause, and subordinate clauses do not use main-clause word order.

Main clause:

• jeg cykler

After før:

• før jeg cykler

So the structure is:

• før
  • subject
    • verb

This is the normal Danish pattern after conjunctions like før, fordi, når, hvis, and at.

Yes. At cykle can mean:

• to ride a bicycle
• to cycle
• to go by bike

In this sentence, før jeg cykler most naturally means something like:

• before I ride off
• before I go cycling
• before I bike away

The exact English wording depends on context, but the Danish is perfectly natural.

Because min sadel is the normal and standard way to say my saddle in Danish.

• min sadel = my saddle

Forms like sadlen min can exist in some contexts or dialectal styles, but for standard Danish, learners should use:

• min cykel
• min sadel
• mit hus
• mine sko

So min sadel is exactly what you would expect here.

It depends on the comma style being used.

In Danish, many writers put a comma before a subordinate clause:

• ..., før jeg cykler

That is very common and fully correct. However, modern Danish comma rules allow some variation depending on whether someone uses startkomma or not.

So for a learner, the safest takeaway is:

• the comma before så is very normal because it separates two main clauses
• the comma before før is also common and correct in many standard written examples

You will see both styles in real Danish writing.