Uden sin lur bliver hun hurtigt træt og græder.

Uden sin lur means without her nap. It is a prepositional phrase:

• uden = without
• sin lur = her nap

Danish often puts this kind of phrase at the beginning of the sentence to set the scene or give context. So the sentence is structured like:

• Uden sin lur = without her nap
• bliver hun hurtigt træt og græder = she quickly gets tired and cries

It is similar to English sentences like:

• Without her nap, she quickly gets tired and cries.

Because sin is the reflexive possessive. It is used when the possessor is the same as the subject of the clause.

In this sentence:

• subject = hun = she
• possessor of the nap = also hun

So Danish uses sin:

• Uden sin lur = without her own nap

If you said hendes lur, it would usually mean someone else’s nap, not the subject’s own.

Compare:

• Hun savner sin mor. = She misses her own mother.
• Hun savner hendes mor. = She misses her mother (someone else’s mother, depending on context).

Also note:

• sin is used with common gender nouns
• sit with neuter nouns
• sine with plural nouns

Since lur is a common gender noun, sin is correct.

This is because Danish is a V2 language in main clauses. That means the finite verb usually comes in second position.

When the sentence begins with something other than the subject, such as Uden sin lur, the verb must come next:

• Uden sin lur bliver hun hurtigt træt og græder.

Structure:

1. Uden sin lur = first element
2. bliver = finite verb in second position
3. hun = subject

If the sentence started with the subject, then you would get:

• Hun bliver hurtigt træt og græder uden sin lur.

Both are possible, but the word order changes because of the V2 rule.

Bliver is the present tense of blive, which often means become or get.

So:

• bliver træt = becomes tired / gets tired

That is different from:

• er træt = is tired

In this sentence, the idea is that she is not tired at first, but then she quickly becomes tired. That is why bliver is the natural choice.

Because hurtigt is an adverb here.

The adjective is:

• hurtig = quick

To make it function as an adverb, Danish often adds -t:

• hurtigt = quickly

So:

• hun bliver hurtigt træt = she quickly gets tired

Compare:

• en hurtig bil = a fast car
• bilen kører hurtigt = the car drives quickly

Here træt is a predicate adjective, describing hun after the verb bliver.

With singular subjects, you normally use the basic form:

• Hun bliver træt. = She gets tired.

You would use trætte with plural subjects:

• De bliver trætte. = They get tired.

So because hun is singular, træt is correct.

Lur means nap, usually a short sleep during the day.

It is a very common word in Danish, especially in everyday speech and when talking about children.

Examples:

• tage en lur = take a nap
• have brug for en lur = need a nap

In this sentence, sin lur means her nap.

Because Danish, like English, normally does not use an article together with a possessive.

So you say:

• sin lur = her nap

not:

• sin en lur

Compare:

• min bog = my book
• hans bil = his car
• deres hus = their house

The possessive already makes the noun definite enough, so no article is needed.

Græder is the present tense of græde, meaning cry.

The whole sentence is in the present tense:

• bliver = gets/becomes
• græder = cries

So the sentence describes something that generally happens or happens in the present:

• Without her nap, she quickly gets tired and cries.

This kind of present tense is very common for habits, general truths, or repeated situations.

Because græder is simply the second verb in a coordination with og = and.

So the structure is:

• bliver hun hurtigt træt
• og græder

In English, this is just like:

• she gets tired and cries

You do not need at here, because græder is not an infinitive and not part of a subordinate clause. It is another finite verb coordinated with the first part.

In this sentence, hurtigt comes before the adjective træt:

• bliver hun hurtigt træt

That sounds natural and means she quickly gets tired.

Adverbs in Danish can sometimes move depending on emphasis and sentence structure, but this position is a very normal one. It keeps the meaning clear: the change into being tired happens quickly.

So this sentence sounds natural and idiomatic as it stands.