Active and Passive Voice: An action of a subject, in relation to an object, is expressed in two ways. These two ways of expressing action of a subject are known as Voices.1. Active Voice 2. Passive Voice. Example. I write a letter. (Active Voice). A letter is written by me.(Passive Voice). The structure of same sentence changes when expressed as Active Voice or Passive Voice. The meaning of a sentence, either expressed as Active Voice or Passive Voice, remains the same.