Døren sitter fast, så jeg kan ikke åpne den.

I

Breakdown of Døren sitter fast, så jeg kan ikke åpne den.

• den: it
• kunne: can
• ikke: not

Questions & Answers about Døren sitter fast, så jeg kan ikke åpne den.

Why is it døren and not en dør or dør?

Døren is the definite form: the door.

• en dør = a door (indefinite)
• dør = door as a general concept, or in compounds/signs (less common as a standalone noun in normal sentences)
  In this context you mean a specific door, so Norwegian naturally uses the definite form: Døren sitter fast.

---

What does sitter fast literally mean, and why use sitter (sit) for a door?

Literally, sitte fast is to sit stuck / to be stuck fast. In Norwegian it’s a very common idiom meaning to be stuck (jammed, wedged, seized).
Norwegian often uses verbs like sitte, stå, ligge where English uses be:

• Døren sitter fast. = The door is stuck.
• Nøkkelen sitter fast i låsen. = The key is stuck in the lock.

---

Could I also say Døren er fast?

Not with the same meaning. fast can mean firm, secure, steady, permanent, and Døren er fast would sound odd and usually not mean “stuck.”
To express “stuck,” the natural choices are:

• Døren sitter fast. (most common)
• Døren har satt seg fast. (the door has gotten stuck)

---

What’s the function of here?