usar

In a sentence

• Necessito usar l'ordinador per fer la meva tasca.

  I need to use the computer to do my task.

  This sentence employs 'usar' in the context of making practical use of an object, specifically the computer.

• Sempre podem usar alternatives si cal.

  We can always use alternatives if needed.

  Here, 'usar' is applied to denote employing or utilizing options in a flexible manner.

• Hem d'aprendre a usar correctament aquest concepte tècnic.

  We must learn to use this technical concept correctly.

  In this example, 'usar' refers to operating or applying knowledge rationally, in this case, about a technical concept.