Students in a classroom of some sort are doing art projects.
Students are working on their art projects in the classroom.
working on their art projects  shows that doing art projects.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_do(e1) & n_project(x4) & of(x4,x5) & n_art(x5) & in(x1,x2) & of(x2,x3) & n_sort(x3) & n_classroom(x2) & n_student(x1))
exists e1 x1 x2 x3 x4.(n_classroom(x4) & in(e1,x4) & on(e1,x2) & n_project(x2) & of(x2,x3) & n_art(x3) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_work(e1) & n_student(x1))