A girl stands behind a boy in a swing.
the girl is writing an exam in class
the girl cannot be pushing a swing and writing an exam at the same time.
exists e1 x1 x2 x3.(behind(e1,x2) & in(x2,x3) & n_swing(x3) & n_boy(x2) & Actor(e1,x1) & v_stand(e1) & n_girl(x1))
exists e1 x1 x2 x3.(n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_write(e1) & in(x2,x3) & n_class(x3) & n_exam(x2))