"Welcome fourth years," she said after she did the roll call, going over it twice to make sure she didn't miss anyone, "to another year at Hogwarts, I'm Professor Van Der Hoek, or Etta," she said, her eyes still scanning the names, "and your charms professor. As I have said to others, I will be your teacher, your support system, but your participation, your effort, and your ability to do well in this class is not my responsibility. I expect you to do well in this class to the best of your abilities and it is your responsibility to put in the effort. It won't be me who'll have to handle the consequences if you were to fail this class. As tiring as it is, your education is important for the rest of your life and it is up to you to make the most of it. I don't expect perfection, but I expect you all to try. Now....I was planning to start off with a review of previous years but I think I might just try with the imperius curse. Can anyone tell me what this is?"