Vask forkleet med en gang keramikkurset er ferdig.

Vask is the imperative form of the verb å vaske (to wash).

In Norwegian, commands usually use the bare verb stem:

• å vaske = to wash
• Vask! = Wash!

So Vask forkleet ... means Wash the apron ...

You do not use å in commands.

Forkleet is the definite form of forkle.

• et forkle = an apron
• forkleet = the apron

Norwegian often adds the definite article to the end of the noun instead of using a separate word like the.

Since forkle is a neuter noun (et noun), the definite ending is -et:

• et forkle
• forkleet

So Vask forkleet means Wash the apron, not just wash an apron.

Because the noun is keramikkurs, not keramikkurs with a simple base of kurs attached in the way English speakers might expect.

This is a compound noun:

• keramikk = ceramics
• kurs = course

Together: keramikkurs = ceramics course

Since kurs is a neuter noun, the definite form is:

• et keramikkurs = a ceramics course
• keramikkurset = the ceramics course

So the sentence uses the definite form: when the ceramics course is finished.

Med en gang literally means with one time, but in natural English it usually means:

• immediately
• right away
• as soon as

In this sentence, it connects naturally with the following clause:

• med en gang keramikkurset er ferdig

That is best understood as as soon as the ceramics course is finished.

So although med en gang can sometimes simply mean right away, here it has the sense of as soon as.

Because this is a subordinate clause, introduced by med en gang in the sense of as soon as.

In Norwegian, subordinate clauses usually keep normal subject + verb order:

• keramikkurset er ferdig = the ceramics course is finished

You do not invert the verb and subject there.

Compare:

• Main clause question: Er keramikkurset ferdig? = Is the ceramics course finished?
• Subordinate clause: ... med en gang keramikkurset er ferdig = ... as soon as the ceramics course is finished

So the lack of inversion is completely normal.

Yes. Ferdig is usually an adjective, meaning finished, ready, or done depending on context.

Here it appears with er:

• er ferdig = is finished / is done

So:

• keramikkurset er ferdig = the ceramics course is finished

This is a very common Norwegian pattern:

• Jeg er ferdig. = I am finished / I’m done.
• Maten er ferdig. = The food is ready.
• Filmen er ferdig. = The film is over / finished.

In Norwegian, commands often leave out the subject, just like in English.

Compare:

• English: Wash the apron.
• Norwegian: Vask forkleet.

The subject is understood to be you.

If you add du, it usually changes the tone and is less like a straightforward command. The simple imperative normally has no expressed subject.

Not naturally. In this sentence, med en gang is understood together with the clause keramikkurset er ferdig, so the meaning is as soon as the ceramics course is finished.

If you wanted the idea Wash the apron immediately. The ceramics course is finished, Norwegian would usually phrase it differently, for example with clearer separation or punctuation.

So in this sentence, the intended structure is:

• Vask forkleet
• med en gang keramikkurset er ferdig

That is: Wash the apron as soon as the ceramics course is finished.

No. A very common alternative is så snart.

For example:

• Vask forkleet så snart keramikkurset er ferdig.

That also means Wash the apron as soon as the ceramics course is finished.

The difference is mostly stylistic:

• så snart is a very direct match for as soon as
• med en gang can mean immediately or as soon as, depending on context

Both are common and natural.

Because med en gang keramikkurset er ferdig functions as one unit, and in modern Norwegian punctuation, you normally do not add a comma there.

Older comma rules in Norwegian sometimes allowed more commas around subordinate clauses, but current standard usage is generally more restrictive.

So this sentence is correctly written without a comma:

• Vask forkleet med en gang keramikkurset er ferdig.

Yes. Å vaske is a transitive verb, so it can take a direct object:

• vaske forkleet = wash the apron
• vaske bilen = wash the car
• vaske hendene = wash the hands

That is why forkleet comes directly after Vask.

Yes, grammatically it is natural. The structure is completely normal:

• imperative verb
• direct object
• time clause

The only thing that might feel a little specific is the situation itself: talking about washing the apron when the ceramics course is done. But grammatically and stylistically, it is fine Norwegian.