remplacer

In a sentence

• Je vais remplacer mon vieux téléphone par un nouveau modèle.

  I will replace my old phone with a new model.

  In this sentence, 'remplacer' is used in the context of substituting one object (the old phone) with another (a new model).

• Nous devons remplacer les batteries usées pour que l'appareil fonctionne.

  We need to replace the worn-out batteries for the device to work.

  Here, 'remplacer' signifies the act of swapping out a non-functional item (the batteries) for a functional one.

• Marie va remplacer le professeur pendant son absence.

  Marie will substitute for the teacher during their absence.

  In this context, 'remplacer' is utilized to mean taking over the responsibilities or role of someone temporarily.