Pappesken er full.

In Norwegian, definiteness is often shown by adding an ending to the noun instead of using a separate word like the.

• pappeske = cardboard box
• pappesken = the cardboard box

So the ending -en here does the job that the does in English.

It is one compound noun, which is very common in Norwegian.

• papp = cardboard
• eske = box
• pappeske = cardboard box
• pappesken = the cardboard box

Norwegian often combines words into one noun where English might use two words.

Er is the present tense of å være, which means to be.

So:

• er = is / am / are

In this sentence, Pappesken er full means that the box is full right now.

The adjective agrees with the noun.

Here, pappesken is singular and common gender, so the adjective stays in its basic form:

• Pappesken er full = singular, common gender

Compare:

• Huset er fullt = The house is full
  
  • huset is neuter, so you use fullt
• Boksene er fulle = The boxes are full
  
  • plural, so you use fulle

So full is correct because pappesken is not neuter and not plural.

Pappeske is usually a feminine noun, but in Bokmål many feminine nouns can also be treated as masculine.

That means you may see:

• en pappeske / pappesken
• ei pappeske / pappeska

Both are possible in Bokmål, depending on writing style and dialect background.
So pappesken er full is completely correct.

Yes. That is also correct in Bokmål if you use feminine forms.

Compare:

• pappesken = definite singular with masculine-style ending
• pappeska = definite singular with feminine ending

Both mean the cardboard box. Which one you use depends on the kind of Bokmål you prefer or what your teacher/course uses.

No, this is the normal word order for a simple statement:

• Pappesken = subject
• er = verb
• full = adjective/complement

So it follows the basic pattern:

subject + verb + complement

Very similar to English: The cardboard box is full.

Here full is used predicatively, which means it comes after the verb er and describes the subject.

• Pappesken er full = the adjective comes after er

This is different from an attributive use, where the adjective comes before the noun:

• en full eske = a full box

So in your sentence, full is not directly before the noun; it describes the noun through the verb er.

Yes. Full can mean both:

• full = full / not empty
• full = drunk

The meaning depends on context.
In Pappesken er full, it clearly means not empty, because a box cannot be drunk.

You would normally say:

• En pappeske er full

If you want feminine forms, you could also say:

• Ei pappeske er full

So the difference is:

• en/ei pappeske = a cardboard box
• pappesken/pappeska = the cardboard box

You could say:

• Pappeskene er fulle = The cardboard boxes are full

Here two things change:

1. The noun becomes plural definite:
   • pappeskene = the cardboard boxes
2. The adjective becomes plural:
   • fulle

So singular and plural look like this:

• Pappesken er full
• Pappeskene er fulle

Pronunciation varies a bit by dialect, but a common Eastern Norwegian pronunciation is approximately:

PAHP-ess-ken er fuhl

A slightly more detailed guide:

• papp sounds roughly like pap in papa, but shorter and with a stronger p
• esken sounds like ESS-ken
• er is often pronounced quite lightly
• full has a rounded vowel that may sound a bit different from English full

If you want, I can also give you a more detailed pronunciation guide with IPA.