Kan De se, om afsender og modtager står tydeligt nok på kuverten?

De is the formal, polite word for you. It is traditionally capitalized so it does not get confused with de, which usually means they.

A native speaker today would usually say du instead of De, so this sentence sounds formal, respectful, and a bit old-fashioned. A more everyday version would be:

Kan du se, om afsender og modtager står tydeligt nok på kuverten?

Because this is a yes/no question.

In Danish, yes/no questions usually put the finite verb first:

• Statement: De kan se ... = You can see ...
• Question: Kan De se ...? = Can you see ...?

So kan comes first, then the subject De.

Here om means whether or if.

It introduces an indirect yes/no question:

• Kan De se, om ... = Can you see whether / if ...

This is a very common use of om after verbs like:

• se = see
• vide = know
• spørge = ask
• undersøge = check/investigate

So this om is not the same as the om meaning about, around, or in.

Because here they are being used more like labels or roles: sender and recipient.

On an envelope, you often think of the fields or pieces of information as afsender and modtager, not necessarily as the sender and the recipient as specific people already identified in the conversation.

So:

• afsender og modtager = sender and recipient
• afsenderen og modtageren = the sender and the recipient

The version in the sentence sounds natural when talking about what is written on the envelope.

Afsender is a noun meaning sender or return sender.

It comes from the verb at afsende, meaning to send off or to dispatch.

On letters and parcels, afsender usually means the person or address sending the item.

Modtager means recipient or receiver.

It comes from the verb at modtage, which means to receive.

So:

• afsender = sender
• modtager = recipient

These are a very common pair in postal and delivery language.

Yes, står literally means stands, but Danish often uses stå when talking about text or information that appears in writing.

So står på kuverten means something like:

• is written on the envelope
• appears on the envelope
• is shown on the envelope

This is very natural Danish. English usually would not say stands on the envelope, but Danish does.

Examples:

• Der står dit navn på pakken. = Your name is written on the package.
• Hvad står der i brevet? = What does it say in the letter?

Because Danish present tense verbs do not change for singular and plural.

So står is used with:

• afsenderen står = the sender stands / is written
• afsender og modtager står = sender and recipient stand / are written

Unlike English, Danish does not have different present-tense verb forms like stands versus stand depending on the subject.

Because tydeligt is the adverb form of tydelig.

• tydelig = clear, distinct
• tydeligt = clearly

Here it describes how the information appears:

• står tydeligt = is written clearly / appears clearly

Danish often uses the -t form this way when an adjective functions adverbially.

Tydeligt nok means clearly enough or legibly enough.

The word nok here means enough or sufficiently.

So the speaker is not just asking whether the sender and recipient are on the envelope, but whether they are visible/readable to a sufficient degree.

Compare:

• står tydeligt = is written clearly
• står tydeligt nok = is written clearly enough

Because the information is written on the envelope, not inside it.

• på kuverten = on the envelope
• i kuverten = in the envelope

Addresses, names, and postal markings are normally på the envelope.

After om, you have a subordinate clause:

om afsender og modtager står tydeligt nok på kuverten

In this clause, the subject comes before the verb:

• afsender og modtager = subject
• står = verb

That is normal subordinate-clause word order in Danish.

A useful contrast:

• Main clause question: Kan De se ...?
• Subordinate clause: om afsender og modtager står ...

So the inversion happens in the main question, not after om.

Not always. It depends on which Danish comma system is being used.

Many writers put a comma before subordinate clauses:

• Kan De se, om afsender og modtager står tydeligt nok på kuverten?

But Danish also allows a system without that comma in many cases:

• Kan De se om afsender og modtager står tydeligt nok på kuverten?

So the comma you see here is normal, but you may also see the sentence written without it.

Yes, but mainly in a formal context because of De.

The structure itself is completely natural. The only part that sounds formal to modern ears is De. In everyday conversation, most people would say:

Kan du se, om afsender og modtager står tydeligt nok på kuverten?

So the sentence is grammatically normal and natural; it is just more polite/formal than everyday speech.