Han vil ikke sværge på det.

In Danish, vil can mean both will in the future sense and want to / be willing to, depending on context.

In Han vil ikke sværge på det, vil is best understood as is not willing to or won’t. So the sentence often has a nuance like:

• He won’t swear to it
• He is not willing to swear to it

It is not just a neutral future statement. It suggests reluctance or refusal.

Because vil is a modal verb. In Danish, modal verbs are followed directly by the infinitive, without at.

Common examples:

• Han vil gå = He wants to go / He will go
• Hun kan svømme = She can swim
• Vi må vente = We must wait

So sværge is the bare infinitive here, and at would be wrong.

This is the normal word order in Danish with a finite verb plus an infinitive.

In Han vil ikke sværge på det:

• Han = subject
• vil = finite verb
• ikke = negation
• sværge = infinitive
• på det = prepositional phrase

So Danish places ikke after the finite verb and before the infinitive:

• Han vil ikke komme
• Jeg kan ikke forstå det

This is very common and natural in Danish sentence structure.

Sværge på is the fixed expression here. It means swear to, swear by, or more idiomatically guarantee / be absolutely certain about something.

So sværge på det does not just mean making an oath in a formal sense. It often means something like:

• I can’t guarantee it
• I wouldn’t swear to it
• I’m not completely certain

The preposition på belongs to the expression. You should learn sværge på noget as a unit.

Yes, it can, depending on context. Sværge can mean:

• to swear an oath
• to swear to something
• sometimes to curse / use swear words

But in Han vil ikke sværge på det, the meaning is clearly swear to it / vouch for it, not use bad language.

So context matters a lot with this verb.

Because det is the neuter pronoun it/that, and here it refers to a general statement, fact, or idea rather than a specific common-gender noun.

In Danish:

• den refers to a common-gender noun
• det refers to a neuter noun, or to a whole situation/statement

In this sentence, det is best understood as that or it in a broad sense: some claim, detail, or piece of information.

So på det means about that / to that / on that point.

It is both grammatically literal and quite idiomatic in meaning.

Literally, it is:

• He will not swear on it

But in natural English, the best equivalent is often:

• He won’t swear to it
• He can’t vouch for it
• He won’t guarantee it
• He’s not completely sure about it

So learners should understand that the phrase often expresses uncertainty, not necessarily a dramatic formal oath.

Normally, no—not with the same meaning.

The idiomatic construction is sværge på noget. Without på, the sentence would sound wrong or would suggest a different structure.

So if you mean swear to it / vouch for it, use:

• sværge på det

It is best to memorize the verb together with its preposition.

Yes, usually it is a bit stronger or at least more idiomatic in a specific way.

• Han er ikke sikker = He is not sure
• Han vil ikke sværge på det = He won’t swear to it / He won’t guarantee it

The second one suggests:

• he may think it is true,
• but he is not confident enough to fully commit to it.

So it often means probably true, but not certain enough to promise or guarantee.

A careful pronunciation is roughly:

Han vil ikke sværge på det

A very rough guide for English speakers might be:

han vil IG-ge SVAIR-uh po deh

A few important notes:

• ikke is often pronounced more like igge
• sværge has a Danish vowel sound that does not match English exactly
• det is often pronounced more like de in normal speech

In connected speech, Danish often sounds softer and more reduced than the spelling suggests.

Yes, but the basic meaning stays the same.

The neutral order is:

• Han vil ikke sværge på det

If another element comes first, Danish uses verb-second word order:

• På det vil han ikke sværge = On that, he won’t swear / As for that, he won’t swear to it

This version sounds more marked or emphatic. For most learners, the original sentence is the normal pattern to focus on first.

No, Danish normally requires an explicit subject in a full sentence.

So you need:

• Han vil ikke sværge på det

You cannot normally just say:

• Vil ikke sværge på det

unless it is an informal fragment in conversation, where the subject is understood from context. In standard full-sentence Danish, the subject should be stated.