Ethan is an amazing instructor for Ling 120B. He designs the course so you feel like you are "discovering" syntax, exploring possible frameworks and selecting the "optimal" one based on real evidence. I've found that this approach allows students to gain a truly strong understanding of the abstract theoretical concepts covered in the class. Additionally, he goes out of his way to be understanding during difficult times and offer help when needed. If you have to take Ling 120B, take it with Ethan!