A classroom of students watching a presentation.
The class is watching presentations that they created
The class was created the presentations they were watching.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_watch(e1) & n_presentation(x4) & (x2 = x3) & n_student(x2) & n_classroom(x1))
exists e2 e1 x1 x2 x3.(n_thing(x1) & n_class(x1) & Theme(e2,x2) & Actor(e2,x1) & v_watch(e2) & Theme(e1,x3) & Actor(e1,x1) & v_create(e1) & (x2 = x3) & n_presentation(x2))