bil

In a sentence

• Jeg har en rød bil.

  I have a red car.

  Here, 'bil' is used as a noun denoting an object, a car, which is described in a possessive context.

• Vi skal tage bilen til byen.

  We will take the car to the city.

  Here, 'bil' is in the definite form 'bilen', expressing a specific car previously referred to or contextually understood.

• Han arbejder som mekaniker og reparerer biler.

  He works as a mechanic and repairs cars.

  In this case, 'bil' is in the plural form 'biler', indicating multiple cars to generalize the objects worked upon.