Godnat, jeg er træt.

It is written as one word: godnat.

This is different from English good night. Danish often writes these common greetings and set expressions as single words, for example:

• godmorgen
• goddag
• godaften
• godnat

Use godnat when you are saying good night, usually because you are leaving, ending a conversation, or going to bed.

Use godaften when you are greeting someone in the evening.

So:

• godaften = hello/good evening
• godnat = good night/bye for the night

That distinction is very important.

The comma separates Godnat from the full clause jeg er træt.

Here, Godnat works like a standalone expression, and then the speaker adds another thought: jeg er træt.

So the structure is roughly:

• Godnat, = a complete farewell expression
• jeg er træt. = a full sentence

It is similar to English punctuation in Good night, I'm tired.

In careful speech, you may hear something close to the written form, but in everyday Danish it is often pronounced more like go' nat.

A useful learner approximation is:

• godnat → go' nat

The d in god is often very weak or disappears in normal speech.

Because er is the present tense of at være (to be) and it is used for all persons in the present tense.

So Danish does not change the verb the way English does:

• jeg er = I am
• du er = you are
• han er = he is
• vi er = we are

So er can mean am, is, or are, depending on the subject.

Normally, no. In a full Danish sentence, you usually need to state the subject.

So:

• Jeg er træt. = correct
• Er træt. = not a normal full sentence

In very informal speech, people may use fragments when the meaning is obvious, but standard Danish grammar wants the subject there.

Because the subject jeg is singular, and the adjective stays in the singular form here.

After verbs like er, Danish adjectives still agree with the subject in number.

Compare:

• jeg er træt = I am tired
• han er træt = he is tired
• vi er trætte = we are tired
• de er trætte = they are tired

So trætte is the plural form.

The æ sound is one English speakers often need to practice.

A rough approximation is that æ sounds somewhat like the vowel in bed, though not exactly the same.

So træt is roughly like:

• tret / treht

The exact Danish vowel is hard to match perfectly in English, but that approximation is a good start.

Also, make sure to pronounce the final t clearly.

In careful speech, you may hear both words clearly, but in everyday Danish they are often reduced.

A rough informal pronunciation can sound something like:

• jeg → yai / yaih
• er → a very weak a

So jeg er træt may sound approximately like:

• yai a træt

The exact sound depends on accent and speaker, but the important point is that spoken Danish is often much more reduced than the spelling suggests.

No. Modern Danish does not capitalize all nouns.

Godnat is capitalized here only because it is the first word of the sentence.

If it appeared in the middle of a sentence, it would normally be lowercase:

• Han sagde godnat.

So this is different from German.

Yes. In a basic statement, this is the normal order:

• subject + verb + complement
• jeg + er + træt

This is the standard way to say it in a simple sentence.

But Danish also follows the verb-second pattern in main clauses, so if you put another element first, the verb still comes second:

• Nu er jeg træt. = Now I am tired.

And if you turn it into a question, the order changes:

• Er jeg træt? = Am I tired?

Yes, it is natural.

A Dane might say Godnat, jeg er træt when they are ending the evening, leaving, or going to bed and giving a reason.

If you only want to say how you feel, then Jeg er træt by itself is also very natural.

So the full sentence sounds especially natural when the speaker is both:

• saying good night, and
• explaining why they are done for the evening.