Hun bøjer det ene ben, fordi knæet stadig er ømt.

Because bøjer is the present tense form of the verb at bøje (to bend).

• at bøje = to bend
• hun bøjer = she bends / she is bending

In Danish, present tense verbs often end in -r:

• jeg bøjer
• du bøjer
• hun bøjer

Unlike English, the verb does not change for different persons very much. The same present-tense form is used with all subjects.

It can mean either, depending on context.

In Danish, the simple present often covers both:

• she bends
• she is bending

So Hun bøjer det ene ben can mean:

• She bends one leg
• She is bending one leg

The exact English translation depends on the situation.

Det ene ben means something more specific than et ben.

• et ben = a leg
• det ene ben = the one leg / one of the legs

In practice, det ene ben often suggests one of the two legs. It points to a specific one, even if it is not named as left or right.

So:

• Hun bøjer et ben = She bends a leg
• Hun bøjer det ene ben = She bends one leg / one of her legs

This phrasing sounds natural when talking about body parts that come in pairs.

Because ben is a neuter noun in Danish:

• et ben = a leg

For neuter nouns, Danish uses det in this kind of structure:

• det ene ben

For common-gender nouns, you would use den instead:

• den ene arm = the one arm

So the choice between den and det depends on the grammatical gender of the noun.

Knæet is the definite singular form of knæ.

• et knæ = a knee
• knæet = the knee

Since knæ is also a neuter noun, its definite singular ending is -et.

More examples:

• et hus → huset
• et ben → benet
• et knæ → knæet

So knæet stadig er ømt means the knee is still sore.

Danish often uses the definite form with body parts when it is already clear whose body part is meant.

So instead of saying:

• hendes knæ = her knee

Danish very naturally says:

• knæet = the knee

Because from the context, we already know it is her knee.

This is very common in Danish with body parts:

• Han løfter hånden = He raises his hand
• Hun lukker øjnene = She closes her eyes

English often prefers a possessive; Danish often does not.

Because fordi introduces a subordinate clause, and in Danish subordinate clauses, the normal position is:

subject + sentence adverb + finite verb

So:

• knæet = subject
• stadig = sentence adverb
• er = finite verb

That gives:

• fordi knæet stadig er ømt

This is different from a main clause, where Danish usually has verb-second word order.

Compare:

• Knæet er stadig ømt.
  main clause

• ... fordi knæet stadig er ømt.
  subordinate clause

This is one of the most important word-order patterns in Danish.

Stadig means still.

So:

• knæet stadig er ømt = the knee is still sore

It shows that the soreness has continued from before until now.

Examples:

• Han sover stadig. = He is still sleeping.
• Det regner stadig. = It is still raining.

Because øm has to agree with the noun it describes, and here it refers to knæet, which is a neuter singular noun.

Forms of the adjective:

• øm = common gender singular
• ømt = neuter singular
• ømme = plural / definite

So:

• en arm er øm = an arm is sore
• et knæ er ømt = a knee is sore
• benene er ømme = the legs are sore

Since knæet is neuter singular, ømt is the correct form.

Here it means physically sore or tender.

In this sentence, ømt is about pain or sensitivity in the knee. A good English match is:

• sore
• tender

So knæet stadig er ømt means the knee still hurts or is still sensitive.

Fordi means because.

It introduces the reason:

• Hun bøjer det ene ben = She bends one leg
• fordi knæet stadig er ømt = because the knee is still sore

So the second part explains why she is bending the leg.

Sometimes for can mean because in Danish, but it does not work exactly the same way as fordi.

• fordi introduces a subordinate clause
• for introduces a coordinating clause

That affects word order.

You can say:

• Hun bøjer det ene ben, fordi knæet stadig er ømt.

You could also say:

• Hun bøjer det ene ben, for knæet er stadig ømt.

Notice the difference:

• after fordi: knæet stadig er ømt
• after for: knæet er stadig ømt

So fordi is the more direct equivalent of because here.

Yes. Ben can mean both leg and bone, depending on context.

In this sentence, it clearly means leg:

• Hun bøjer det ene ben = She bends one leg

Because you bend a leg, and the rest of the sentence talks about a sore knee.

If the context were different, ben could also mean bone.

The present sentence is:

• Hun bøjer det ene ben, fordi knæet stadig er ømt.

A past-tense version would be:

• Hun bøjede det ene ben, fordi knæet stadig var ømt.

Changes:

• bøjer → bøjede
• er → var

So:

• bøjede = bent / was bending
• var ømt = was sore

The Danish ø does not have an exact English equivalent, which is why learners often ask about it.

A rough guide:

• it is a rounded front vowel
• you make a sound somewhat like e in her or i in bird, but with rounded lips

This is only an approximation, but it can help.

In this sentence:

• bøjer
• ømt

both contain that ø sound.

It is worth listening to native audio for this vowel, because spelling alone usually is not enough.

Yes, it is completely natural.

It follows a very normal pattern:

1. main clause
   Hun bøjer det ene ben
2. subordinate clause with reason
   fordi knæet stadig er ømt

It sounds like ordinary spoken or written Danish, especially in a context describing someone’s movement and explaining the reason for it.