A man doing a back flip off a box
A man is sitting on the box.
Person who is sitting down can not be doing back flip at the same time.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & off(e1,x4) & n_box(x4) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_back(x3) & a_flip(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_box(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))