People are sitting at desks in a library.
People are throwing desks at the windows at the library
One who is sitting is usually not throwing.
exists e1 x1 x2 x3.(in(e1,x3) & n_library(x3) & at(e1,x2) & n_desk(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists e1 x1 x2 x3 x4.(n_library(x4) & n_window(x3) & at(e1,x4) & at(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_desk(x2) & n_people(x1))