Rebecca Johnson, a professor of culture and ethics at USMC, has the best advice ever. Still confused about what's the difference between passive and active voice? According to Professor Johnson, if you can add the phrase "by zombies" after the verb, your sentence has passive voice.
Passive Voice = She was chased [by zombies].
Active Voice = Zombies chased [by zombies] her.
And voila! Now there's a simple and fun way to identify when you're using passive voice. More questions? Stop by the Writing Center and we can talk about your paper in a one-on-one session.