Two feet and a surfboard emerging from a wave.
The boy is walking his dog.
One cannot be surfboarding and walking his dog simultaneously.
exists e1 s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & from(e1,x4) & n_wave(x4) & Actor(e1,x3) & v_emerge(e1) & (x2 = x3) & n_surfboard(x2) & subset_of(x1,s1) & n_foot(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_dog(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1))