Han kan bevise det.

Because kan is a modal verb, like can in English. After a modal verb in Danish, the next verb stays in the infinitive without at.

So:

• han kan bevise det = he can prove it
• not han kan at bevise det

This is similar to English:

• he can prove it
• not he can to prove it

Here is the role of each word:

• Han = subject pronoun, meaning he
• kan = modal verb, meaning can / is able to
• bevise = main verb in the infinitive, meaning prove
• det = object pronoun, meaning it or sometimes that, depending on context

So the structure is:

• subject + modal verb + main verb + object

Danish main clauses usually follow the V2 rule, which means the finite verb must be in the second position.

In this sentence:

• Han = first element
• kan = finite verb, so it comes second

That gives:

• Han kan bevise det

This is the normal word order for a simple statement.

Because det is the object of bevise.

In a clause with a modal verb:

• the finite verb comes early: kan
• the main verb stays in infinitive form: bevise
• the object often comes after that: det

So:

• Han kan bevise det

This is very natural Danish word order.

It can mean either, depending on context.

In many cases, det corresponds to English it:

• Han kan bevise det = he can prove it

But in other contexts, English might translate it as that:

• he can prove that

Danish uses det very often where English chooses either it or that, so the exact English word depends on what is being referred to.

It can express both.

Most commonly, kan means:

• ability: he is able to prove it
• possibility: he may be able to prove it / it is possible for him to prove it

So kan is broader than just physical ability. Context tells you which shade is intended.

You usually add ikke after the finite verb and before the infinitive/main verb:

• Han kan ikke bevise det.

That means:

• he cannot prove it

This placement is very common with modal verbs in Danish.

In a yes/no question, the finite verb comes first:

• Kan han bevise det?

That means:

• can he prove it?

So the statement:

• Han kan bevise det.

becomes the question:

• Kan han bevise det?

The infinitive is bevise.

You can recognize it as the basic dictionary form of the verb. After modal verbs like kan, vil, skal, and må, Danish uses this bare infinitive form.

So:

• kan bevise
• vil bevise
• skal bevise

Yes, it is completely natural.

It sounds like standard, correct Danish and could be used in many situations, for example when talking about evidence, arguments, or facts.

It is simple, grammatical, and idiomatic.

A rough guide is:

• bevise ≈ buh-VEE-suh

The stress is on the second syllable:

• be-VI-se

A few helpful points:

• be- is usually weak
• vi is the stressed part
• the final -e is often a light schwa-like sound

Exact pronunciation depends a bit on accent and speaking speed, but the main thing is to stress vi.

Yes. The pattern stays the same.

For example:

• Jeg kan bevise det. = I can prove it
• Du kan bevise det. = you can prove it
• Vi kan bevise det. = we can prove it
• De kan bevise det. = they can prove it

Notice that kan does not change for person the way English can also does not change.

Yes, it often would.

In a main clause:

• Han kan bevise det.

But after a conjunction like at, Danish normally puts the finite verb later:

• ... at han kan bevise det

This example looks the same because the sentence is short, but in subordinate clauses, adverbs like ikke show the difference clearly:

• main clause: Han kan ikke bevise det.
• subordinate clause: ... at han ikke kan bevise det.

So Danish learners often notice word order differences most clearly when words like ikke are added.