Class structures refer to the way in which classes are organized in a school setting. This includes the physical layout of the classroom, the seating arrangement of students, and the way in which the teacher interacts with the students. The term 'desks' is often used to refer to the physical furniture in a classroom, such as the desks and chairs that students use to work on assignments. Desks are an important part of class structures, as they provide a place for students to work and interact with each other.