How can we change passive voice to active voice in writing?

To change passive voice to active voice, make the agent of the sentence into the subject, and turn the old subject into the object. For example a passive sentence would look like this: “The article is being read by most of my class” the agent “most of my class” and the subject is the article. Written in active voice the sentence would be “most my class is reading the article”. Here the new subject is most of my class and the object is the article.