The young man is surfing.
A boy is in the ocean.
If the boy is surfing, he is in the ocean.
exists e1 s1 x1.(n_man(x1) & a_young(s1) & Theme(s1,x1) & Actor(e1,x1) & v_surf(e1))
exists p1 x1 x2.(n_ocean(x2) & in(x1,x2) & n_boy(x1))