A man pulling a small boat across some water.
the man is flying an air plane
You cannot be flying an airplane and pulling a boat at the same time.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & across(e1,x4) & n_water(x4) & Theme(e1,x3) & Actor(e1,x2) & v_pull(e1) & n_boat(x3) & a_small(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_fly(e1) & n_plane(x2) & of(x2,x3) & n_air(x3))