Active voice

  is

Auxiliar

  used

Verbo

  in

Adposición

  a

Determinador

  clause

Substantivo

  whose

Pronome

  subject

Substantivo

  expresses

Verbo

  the

Determinador

  main

Adxectivo

 verb's  agent

Substantivo

.

Active voice is used in a clause whose subject expresses the main verb's agent.

Active voice is used in a clause whose subject expresses the main verb's agent.