A boy surfs.
he is practicing for the semi finalists in surfing
Not all surfers are practicing for the semi finals.
exists e1 x1.(Actor(e1,x1) & v_surf(e1) & n_boy(x1))
exists e1 x1 x2 x3.(n_finalist(x2) & of(x2,x3) & n_semus(x3) & for(e1,x2) & in(x2,x1) & n_surfing(x1) & Actor(e1,x1) & v_practice(e1) & n_male(x1))