personen

In a sentence

• Personen står vid dörren.

  The person is standing by the door.

  In this sentence, 'personen' is used as a noun referring to a singular individual, with a definite article implied by the suffix '-en'.

• Jag tänkte på personen som hjälpte mig igår.

  I thought about the person who helped me yesterday.

  Here, 'personen' serves as the subject being thought about and is defined by the relative clause 'som hjälpte mig igår'.

• Är personen som du pratade med idag den nya chefen?

  Is the person you talked to today the new boss?

  In this instance, 'personen' is used in a question as a direct reference to a specific individual defined by the context.