Opnaðu gluggann varlega; hann er fastur.

to be

Breakdown of Opnaðu gluggann varlega; hann er fastur.

• opna: to open
• glugginn: the window
• hann: it

Questions & Answers about Opnaðu gluggann varlega; hann er fastur.

Why does Opnaðu end with -ðu?

Opnaðu is the verb opna (to open) in the imperative (command) form addressed to one person (singular “you”).
Icelandic commonly attaches a 2nd-person pronoun ending to the imperative:

• Opna! = Open! (can sound more abrupt)
• Opnaðu! = Open (you)! (very common, often a bit more natural in everyday speech)

You’ll see the same pattern with many verbs (e.g., Komdu = Come!).

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Is Opnaðu informal? How would I say it to more than one person or more politely?

Yes—Opnaðu is for one person and corresponds to informal you.

Other common options:

• To more than one person: Opnið gluggann varlega. (plural imperative)
• A very common polite/less direct phrasing is not “please + imperative” but a question-like request, e.g.:
  • Geturðu opnað gluggann varlega? (Can you open the window carefully?)
  • Gætirðu opnað gluggann varlega? (Could you open…?; more polite)

(You can still add vinsamlegast = please, but it can sound formal.)

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Why is it gluggann and not ?