A man in a wetsuit is surfing on the ocean.
A man building a fire
A man cannot build a fire at the same time he is surfing.
exists e1 x1 x2 x3.(n_ocean(x3) & on(e1,x3) & Actor(e1,x1) & v_surf(e1) & in(x1,x2) & n_wetsuit(x2) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_build(e1) & n_fire(x3) & (x1 = x2) & n_man(x1))