A man is surfing, halfway out of a wave.
A man is afraid of the wave.
Surfing does not imply being afraid.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_surf(e1) & of(x3,x4) & n_wave(x4) & out(x2,x3) & n_thing(x3) & n_halfway(x2) & n_man(x1))
exists s1 x1 x2.(n_wave(x2) & of(s1,x2) & Theme(s1,x1) & a_afraid(s1) & n_man(x1))