Læreren siger, at ordet står i bestemt form.

Because Danish usually adds the definite article to the end of the noun.

• lærer = teacher
• læreren = the teacher

Here, -en is the singular definite ending for a common-gender noun.

So:

• en lærer = a teacher
• læreren = the teacher

For the same reason: Danish marks definiteness by adding an ending to the noun.

• ord = word
• ordet = the word

Here, the ending is -et, which is used for many neuter nouns in the singular definite form.

So:

• et ord = a word
• ordet = the word

It depends on the noun’s grammatical gender.

• lærer is a common-gender noun, so its definite singular form is læreren
• ord is a neuter noun, so its definite singular form is ordet

A useful pattern is:

• en noun → definite -en
• et noun → definite -et

Examples:

• en bog → bogen
• et hus → huset

Bestemt form means definite form.

It refers to a noun form that corresponds to English the ....

For example:

• en lærer = indefinite form

• læreren = definite form

• et ord = indefinite form
• ordet = definite form

So when the sentence says ordet står i bestemt form, it means the word is written or appears in its definite form.

At here means that and introduces a subordinate clause.

• Læreren siger = The teacher says
• at ordet står i bestemt form = that the word is in the definite form

English often drops that, but Danish often keeps at in this kind of sentence.

So Danish:

• Læreren siger, at ...

English:

• The teacher says that ...
• or simply The teacher says ...

Because after at, Danish normally uses subordinate clause word order, where the subject comes before the verb.

So:

• ordet = subject
• står = verb

That gives:

• at ordet står ...

This is different from the verb-second pattern used in many main clauses.

Compare:

• Main clause: Ordet står i bestemt form
• Subordinate clause: ... at ordet står i bestemt form

In both of these, the subject comes before the verb, but after other elements in a main clause, Danish often forces the verb into second position. After at, that verb-second rule does not apply.

Yes, stå literally often means stand, but in this sentence it is being used in a more idiomatic, grammatical way.

Here, står i bestemt form means something like:

• is written in the definite form
• appears in the definite form
• is in the definite form

This is common in grammar talk and dictionary-style language.

So it is not about physically standing; it is about the form a word appears in.

Because i bestemt form is a standard grammatical expression, almost like a label.

Danish often uses short article-less expressions after prepositions in grammar terminology, such as:

• i bestemt form
• i ubestemt form
• i nutid
• i datid

Using i den bestemte form is possible in some contexts, but it sounds more specific and less like a fixed grammar term.

So in grammar explanations, i bestemt form is the normal phrasing.

Because bestemt form is the normal singular form of this grammar label.

In Danish, bestemte is often used when the adjective is:

• plural, or
• in a clearly definite noun phrase

For example:

• den bestemte form = the definite form

But here the phrase is not den bestemte form. It is the fixed expression i bestemt form, so bestemt is the expected form.

Yes.

In at ordet står i bestemt form:

• ordet = the subject
• står = the verb
• i bestemt form = a prepositional phrase describing the grammatical form

So the clause structure is:

• at
  • subject
    • verb
      • prepositional phrase

In modern Danish, comma use around subordinate clauses can vary depending on the comma system being followed, but the comma before at is very common and completely natural here.

So:

• Læreren siger, at ordet står i bestemt form.

is a normal written sentence.

For a learner, the safest choice is to keep the comma in this kind of sentence.

You would change the noun form to plural, and possibly the rest depending on the meaning.

For example:

• ordene = the words

Then you could say:

• Læreren siger, at ordene står i bestemt form.

That means The teacher says that the words are in the definite form.

So:

• singular: ordet
• plural definite: ordene

Yes, but it sounds like something from a classroom, grammar explanation, textbook, or language discussion.

A Danish speaker might use it when explaining grammar, spelling, or dictionary forms.

So it is natural, but it belongs especially to an educational or linguistic context rather than casual everyday conversation.