Plasteret sidder stadig på min finger.

Here plasteret means the plaster, in the British sense: a small adhesive bandage. In American English, the Band-Aid or the bandage would often be the most natural translation.

A useful warning: Danish plaster does not usually mean wall plaster in this kind of sentence.

Because plasteret is the definite singular form: the plaster.

• et plaster = a plaster
• plasteret = the plaster

The noun plaster is a neuter noun, so the definite ending is -et.

Danish very often uses verbs like sidde, stå, and ligge where English would simply use be.

Here, sidder does not literally mean that the plaster is physically sitting like a person. It means that it is fixed, attached, or positioned there.

So:

• Plasteret sidder på min finger = the plaster is attached/on my finger
• English usually says The plaster is on my finger, not sits on my finger

Using sidder sounds very natural in Danish.

Yes, its basic meaning is sits, but Danish uses it more broadly than English.

It can describe something that is:

• attached somewhere
• positioned somewhere
• fitting in a certain way

So in this sentence, sidder is best understood as is sitting/is attached/is on.

Yes, that would be understood, and it is not wrong.

But sidder is more idiomatic because it emphasizes that the plaster is still attached to the finger. Er is more neutral and less vivid.

So:

• Plasteret sidder stadig på min finger = more natural
• Plasteret er stadig på min finger = understandable, but less idiomatic

Stadig means still.

It shows that the situation continues:

• Plasteret sidder stadig på min finger = the plaster is still on my finger

It is about continuation, not repetition.

Because that is the normal word order in a Danish main clause.

The sentence structure is:

• Plasteret = subject
• sidder = finite verb
• stadig = adverb
• på min finger = prepositional phrase

So the pattern is:

subject + verb + adverb + rest

That is why stadig comes after sidder.

Because på is the natural preposition for something that is on or attached to the surface of a body part.

So:

• på min finger = on my finger

Other prepositions would change the meaning:

• i min finger = in my finger
• om min finger = around my finger

A ring is very naturally om or på depending on context, but a plaster is normally said to be på the finger.

In standard Danish, a possessive like min normally comes before the noun and replaces the article.

So:

• fingeren = the finger
• min finger = my finger

You do not say min fingeren.

For a learner, the safest pattern is:

• min finger
• din finger
• hans finger
• min hånd
• mit ben

A word-by-word breakdown is:

• Plasteret = the plaster / the bandage
• sidder = sits / is attached
• stadig = still
• på = on
• min finger = my finger

A very literal version would be:

The plaster sits still on my finger

But natural English would be:

The plaster is still on my finger
or
The Band-Aid is still on my finger

Roughly, sidder sounds like SID-er, but with a soft Danish d, not a strong English d.

In standard Danish pronunciation, it is approximately:

[ˈseðɐ]

The important thing for learners is:

• stress the first syllable
• do not pronounce the d as a hard English d
• the ending is a soft -er sound

You do not need perfect pronunciation right away to be understood.