Passive voice is the hidden killer of strong writing. The opposite of passive voice is active voice. Put simply, with active voice, the subject does the action. In passive voice, the subject receives the action. This distinction makes all the difference between writing that reads like a book report versus writing that draws you into a story.
For example, in passive voice, you would write that "an article is being written by me." The article is the subject, receiving the action. The active voice version would read, "I am writing an article." You are the subject, creating the action. Used consistently, active voice draws the reader in and creates a stronger sense of story. When you finish a piece of writing, re-read it to find and eliminate passive voice.