opnuð

In a sentence

• Dyrið var opnuð þegar við komum.

  The door was opened when we arrived.

  Here, 'opnuð' is used as a verb in the past participle form, agreeing with the feminine singular noun 'dyrið' (door).

• Konan opnuð gluggann til að inn kom ferskt loft.

  The woman opened the window to let in fresh air.

  'Opnuð' functions here as the action performed by the subject 'konan' (the woman), showing direct action.

• Sögubókin hafði verið opnuð á síðunni þar sem sagan hófst.

  The storybook had been opened on the page where the tale began.

  In this example, 'opnuð' is part of a passive voice structure, indicating the state of the object 'sögubókin' (storybook).