haciendo

In a sentence

• Estoy haciendo la tarea de matemáticas.

  I am doing the math homework.

  In this sentence, "haciendo" is the gerund form of the verb "hacer" functioning as part of the present continuous tense to describe an ongoing action.

• Estaba haciendo ejercicio cuando me llamaste.

  I was exercising when you called me.

  Here, "haciendo" is again in its gerund form, this time part of a past continuous tense, indicating an action that was occurring in the past when interrupted by another action.

• Voy al taller porque están haciendo reparaciones en mi coche.

  I am going to the workshop because they are making repairs to my car.

  In this sentence, "haciendo" describes an ongoing action performed by others, conveyed in the third person plural.