A man in black surfs on a wave.
The boy is swimming to the wave.
The man in black surfs on a wave but it does not imply that the boy is swimming to the wave.
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x2) & on(x2,x3) & n_wave(x3) & n_surf(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(n_wave(x2) & n_boy(x1) & to(e1,x2) & Actor(e1,x1) & v_swim(e1))