A man holding a camera underwater.
A man holds a camera while skydiving.
man cannot be skydiving if he is underwater.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_hold(e1) & n_underwater(x3) & of(x3,x4) & n_camera(x4) & (x1 = x2) & n_man(x1))
exists e2 e1 x1 x2.(while(e1,e2) & Actor(e2,x1) & v_skydive(e2) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_camera(x2) & n_man(x1))