Hun ryster ikke dåsen, fordi den allerede er åben.

Because Danish usually puts definiteness on the end of the noun.

• en dåse = a can
• dåsen = the can

So dåsen is the definite form of dåse. English uses a separate word (the), but Danish often uses a suffix instead.

Because dåse is a common-gender noun, not a neuter noun.

In Danish:

• common gender nouns take den
• neuter nouns take det

Since it is en dåse, the matching pronoun is den. If the noun were neuter, you would use det instead.

Ryste is the infinitive form, meaning to shake.
Ryster is the present tense, meaning shake / is shaking depending on context.

So:

• at ryste = to shake
• hun ryster = she shakes / she is shaking

Danish does not change the present-tense verb ending for different persons the way English does. So jeg ryster, du ryster, hun ryster, vi ryster all use the same verb form.

In a normal Danish main clause, the finite verb usually comes early, and ikke typically comes after that verb.

So:

• Hun ryster ikke dåsen

This is the natural Danish word order. English speakers often expect something closer to Hun ikke ryster..., but that is not correct in an ordinary main clause.

A useful pattern is:

subject + finite verb + ikke + object

So here:

• Hun = subject
• ryster = finite verb
• ikke = negation
• dåsen = object

Because fordi introduces a subordinate clause, and subordinate clauses often have different word order in Danish.

In a main clause, you would usually say:

• Den er allerede åben.

But after fordi, Danish normally places words like allerede, ikke, aldrig, and similar adverbs before the finite verb:

• fordi den allerede er åben

So this is a very important contrast:

• main clause: Den er allerede åben
• subordinate clause: fordi den allerede er åben

Because åben agrees with the gender and number of the noun it describes.

Here, the noun behind den is dåse, which is a common-gender singular noun, so the adjective form is:

• åben

Compare:

• common gender singular: en dåse er åben
• neuter singular: et vindue er åbent
• plural: dørene er åbne

So åben is the correct form for dåse.

Allerede means already. It shows that the can is open before the possible shaking would happen.

So the reason she does not shake the can is that it is already open.

Its position is also grammatical: in the subordinate clause after fordi, allerede comes before er:

• fordi den allerede er åben

Yes, but the structure would change.

With fordi, you get a subordinate clause:

• Hun ryster ikke dåsen, fordi den allerede er åben.

With for, you get a main clause after it:

• Hun ryster ikke dåsen, for den er allerede åben.

Both can often be translated as because, but they are not built the same way. For learners, fordi is usually the most straightforward and common choice for giving a reason.

Often you will see a comma there, as in this sentence:

• Hun ryster ikke dåsen, fordi den allerede er åben.

In modern Danish, comma use before subordinate clauses can depend on the comma system being followed. So learners may see both versions:

• Hun ryster ikke dåsen, fordi den allerede er åben.
• Hun ryster ikke dåsen fordi den allerede er åben.

The version with the comma is very common in teaching materials because it makes the clause boundary clearer.

Because Danish usually marks definiteness by attaching it to the noun instead of adding a separate article in front.

So instead of the can, Danish says:

• dåsen

This is one of the big differences from English. A good basic pattern is:

• en dåse = a can
• dåsen = the can

English uses a separate article; Danish often uses an ending.

Sometimes, yes, but it is not exactly the same in feel.

• åben usually describes the state open
• åbnet can sound more like opened or emphasize the result of an opening action

In this sentence, åben is the most natural simple description of the can’s state:

• den allerede er åben

So a learner should understand åben here as the normal adjective meaning open.